Partition type

The partition type (or partition ID) in a partition's entry in the partition table inside a master boot record (MBR) is a byte value intended to specify the file system the partition contains or to flag special access methods used to access these partitions (e.g. special CHS mappings, LBA access, logical mapped geometries, special driver access, hidden partitions, secured or encrypted file systems, etc.).

This article is about MBR partition types in IBM PC compatible systems. For GPT partition types, see GUID Partition Table § Partition type GUIDs. For Amiga RDB partition types, see Rigid Disk Block.

Overview

Lists of assigned partition types to be used in the partition table in the MBR were originally maintained by IBM and Microsoft internally. When the market of PC operating systems and disk tools grew and liberated, other vendors had a need to assign special partition types to their products as well. As Microsoft neither documented all partition types already assigned by them nor wanted to maintain foreign assignments, third parties started to simply assign partition types on their own behalf in a mostly uncoordinated trial-and-error manner. This led to various conflictive double-assignments sometimes causing severe compatibility problems between certain products.[1]

Several industry experts including Hale Landis, Ralf D. Brown, Matthias R. Paul, and Andries E. Brouwer in the 1990s started to research partition types and published (and later synchronized) partition type lists in order to help document the industry de facto standard and thereby reduce the risk of further conflicts. Some of them also actively helped to maintain software dealing with partitions to work with the updated lists, indicated conflicts, devised additional detection methods and work-arounds for vendors, or engaged in coordinating new non-conflictive partition type assignments as well.

While not officially maintained,[1] new assignments should be coordinated, in particular any new temporary partition type assignments for local or experimental projects can utilize type 7Fh in order to avoid conflicts with already assigned types. This type was specially reserved for individual use as part of the Alternative OS Development Partition Standard (AODPS) initiative since 2002.[2]

It is up to an operating system's boot loader or kernel how to interpret the value. So the table specifies which operating systems or disk-related products introduced an ID and what file system or special partition type they mapped it to. Partitions with partition types unknown to the software should be treated as reserved but occupied disk storage space which should not be dealt with by the software, save for partition managers.

List of partition IDs

This is a list of known master boot record partition types on IBM PC compatible computers:

Partition IDOccurrenceAccessBootableTypeOriginSupported byDescription
00hMBR, EBRN/ANoFreeIBMAllEmpty partition entry
01hMBR, EBRCHS, LBAx86, 68000, 8080/Z80File systemIBMDOS 2.0+FAT12 as primary partition in first physical 32 MB of disk or as logical drive anywhere on disk (else use 06h instead)[3][4][5]
02hMBRCHSx86, 68000, Z8000, PDP-11File systemMicrosoft, SCOXENIXXENIX root (see 03h and FFh)[3]
03hMBRCHSNoFile systemMicrosoft, SCOXENIXXENIX usr (see 02h and FFh)[3]
04hMBR, EBRCHS, LBAx86, 68000, 8080/Z80File systemMicrosoftDOS 3.0+FAT16 with less than 65536 sectors (32 MB). As primary partition it must reside in first physical 32 MB of disk, or as logical drive anywhere on disk (else use 06h instead).[3][4][5]
05hMBR, EBRCHS, (LBA)No, AAPContainerIBMSome versions of DOS 3.2, DOS 3.3+Extended partition with CHS addressing. It must reside within the first physical 8 GB of disk, else use 0Fh instead (see 0Fh, 85h, C5h, D5h)[3][4][5]
06hMBR, EBRCHS, LBAx86File systemCompaqDOS 3.31+FAT16B with 65536 or more sectors. It must reside within the first 8 GB of disk unless used for logical drives in an 0Fh extended partition (else use 0Eh instead). Also used for FAT12 and FAT16 volumes in primary partitions if they are not residing in first physical 32 MB of disk.[nb 1][3][4][5]
07hMBR, EBRCHS, LBAx86File systemMicrosoft, IBMOS/2 1.2+IFS
MBR, EBRCHS, LBA286File systemIBMOS/2 1.2+, Windows NTHPFS[3]
MBR, EBRCHS, LBA386File systemMicrosoftWindows NTNTFS[4][5]
MBR, EBRCHS, LBAYesFile systemMicrosoftWindows Embedded CEexFAT
File system Quantum Software SystemsQNX 2QNX "qnx" (7) (pre-1988 only)[6][nb 2]
08hMBRCHSx86File systemCommodoreCommodore MS-DOS 3.xLogical sectored FAT12 or FAT16[nb 3]
CHSx86File systemIBMOS/2 1.0-1.3OS/2 (FAT?)
File system IBMAIXAIX boot/split
File system Quantum Software SystemsQNX 1.x/2.xQNX "qny" (8)[6][nb 2]
Container DellPartition spanning multiple drives
09hFile system IBMAIXAIX data/boot
File system Quantum Software SystemsQNX 1.x/2.xQNX "qnz" (9)[6][nb 2]
MBRCHS286File systemMark Williams CompanyCoherentCoherent file system
MBRFile systemMicrowareOS-9OS-9 RBF
0AhService PowerQuest, IBMOS/2OS/2 Boot Manager[nb 4]
Swap Mark Williams CompanyCoherentCoherent swap partition
0BhMBR, EBRCHS, LBAx86File systemMicrosoftDOS 7.1+FAT32 with CHS addressing[4][5]
0ChMBR, EBRLBAx86File systemMicrosoftDOS 7.1+FAT32 with LBA[4][5]
0EhMBR, EBRLBAx86File systemMicrosoftDOS 7.0+FAT16B with LBA[4][5]
0FhMBR, EBRLBANo, AAPContainerMicrosoftDOS 7.0+Extended partition with LBA (see 05h and CFh)[4][5]
11hMBRCHSx86File systemLeading EdgeLeading Edge MS-DOS 3.xLogical sectored FAT12 or FAT16[nb 3]
Hidden FSIBMOS/2 Boot ManagerHidden FAT12 (corresponds with 01h)[nb 4]
12hMBRCHS, LBAx86Service FSCompaqConfiguration partition (bootable FAT with MS-DOS[4][5][7]); Recovery partition (bootable FAT32 with Windows setup[8])
MBR x86 ServiceGang of NineEISA machines EISA configuration utility for the system[4][5]
HibernationCompaqCompaq ConturaHibernation partition[7]
MBRx86Service FSNCRDiagnostics and firmware partition (bootable FAT)[7]
MBRx86Service FSIntelService partition (bootable FAT)[7] (see 98h)
Service FSIBMRescue and Recovery partition[7]
14hFile systemASTAST MS-DOS 3.xLogical sectored FAT12 or FAT16[nb 3] (see AST MBR)
x86, 68000, 8080/Z80Hidden FSIBMOS/2 Boot ManagerHidden FAT16 (corresponds with 04h)[nb 4]
LBAx86 File systemLasse Krogh Thygesen Maverick OSOmega file system[9]
15hNo, AAPHidden containerIBMOS/2 Boot ManagerHidden extended partition with CHS addressing (corresponds with 05h)[nb 4]
LBANo Swap Lasse Krogh Thygesen Maverick OSSwap[9]
16hx86, 68000, 8080/Z80Hidden FSIBMOS/2 Boot ManagerHidden FAT16B (corresponds with 06h)[nb 4]
17hHidden FSIBMOS/2 Boot ManagerHidden IFS (corresponds with 07h)[nb 4]
Hidden HPFS (corresponds with 07h)[nb 4]
Hidden NTFS (corresponds with 07h)[nb 4]
Hidden exFAT (corresponds with 07h)[nb 4]
18hNoHibernationASTAST WindowsAST Zero Volt Suspend or SmartSleep partition
19hWillow SchlangerWillowtech Photon coSWillowtech Photon coS (see 20h)
1BhHidden FSIBMOS/2 Boot ManagerHidden FAT32 (corresponds with 0Bh)[nb 4]
1ChHidden FSIBMOS/2 Boot ManagerHidden FAT32 with LBA (corresponds with 0Ch)[nb 4]
Service FSASUSASUS eRecoveryASUS recovery partition (Hidden FAT32 with LBA, see 0Ch)[10]
1EhHidden FSIBMOS/2 Boot ManagerHidden FAT16 with LBA (corresponds with 0Eh)[nb 4]
1FhMBR, EBRLBAHidden containerIBMOS/2 Boot ManagerHidden extended partition with LBA addressing (corresponds with 0Fh)[nb 4]
20h? File system MicrosoftWindows MobileWindows Mobile update XIP
File system Willow SchlangerWillowsoft Overture File System (OFS1) (see 19h)
21hMBR? Hewlett PackardHP Volume Expansion [nb 5]
File systemDave PoirierOxygenFSo2 (Oxygen File System) (see 22h)
22hContainerDave PoirierOxygenOxygen Extended Partition Table (see 21h)
23h YesFile system MicrosoftWindows MobileWindows Mobile boot XIP
24hMBRCHSx86File systemNECNEC MS-DOS 3.30Logical sectored FAT12 or FAT16[11][nb 3] (see NEC MBR)
27hService FSMicrosoftWindowsWindows Recovery Environment (RE) partition (hidden NTFS partition type 07h)[12]
MBRLBAYesService FSAcerD2D eRecoveryRescue partition (Hidden NTFS labeled "PQService", corresponds to 07h)
? Service RooterBOOTRooterBOOT kernel partition (contains a raw ELF Linux kernel, no file system)
2AhFile systemKurt SkauenAtheOSAtheOS file system (AthFS, AFS) (an extension of BFS, see 2Bh and EBh)
MBR, EBRLBAx86File systemReserved (see CAh)
2BhFile system Kristian van der VlietSyllableOSSyllableSecure (SylStor), a variant of AthFS (an extension of BFS, see 2Ah and EBh)
31hMicrosoft, IBMReserved
33hMicrosoft, IBMReserved
34hMicrosoft, IBMReserved
35hMBR, EBRCHS, LBANoFile systemIBMOS/2 Warp Server / eComStationJFS (OS/2 implementation of AIX Journaling File system)
36hMicrosoft, IBMReserved
38hFile system Timothy WilliamsTHEOSTHEOS version 3.2, 2 GB partition
39hContainerBell LabsPlan 9Plan 9 edition 3 partition (sub-partitions described in second sector of partition)
File system Timothy WilliamsTHEOSTHEOS version 4 spanned partition
3AhFile system Timothy WilliamsTHEOSTHEOS version 4, 4 GB partition
3BhContainer Timothy WilliamsTHEOSTHEOS version 4 extended partition
3ChService PowerQuestPartitionMagicPqRP (PartitionMagic or DriveImage in progress)[13]
3DhHidden FSPowerQuestPartitionMagicHidden NetWare
40hPICK SystemsPICKPICK R83
VenturComVenixVenix 80286
41hYesPersonal RISCPersonal RISC Boot
LinuxLinuxOld Linux/Minix (disk shared with DR DOS 6.0) (corresponds with 81h)
PowerPCPowerPCPowerPCPPC PReP (Power PC Reference Platform) Boot
42hSecured FSPeter GutmannSFSSecure File system (SFS)
NoLinuxLinuxOld Linux swap (disk shared with DR DOS 6.0) (corresponds with 82h)
ContainerMicrosoftWindows 2000, XP, etc.Dynamic extended partition marker[4][5]
43hYesFile systemLinuxLinuxOld Linux native (disk shared with DR DOS 6.0) (corresponds with 83h)
44hWildfileGoBackNorton GoBack, WildFile GoBack, Adaptec GoBack, Roxio GoBack
45hCHSPriamPriam (see also 5Ch)
MBRCHSYesBoot-USBoot-US boot manager (1 cylinder)
Jochen Liedtke, GMDEUMEL/ELANEUMEL/ELAN (L2)
46hJochen Liedtke, GMDEUMEL/ELANEUMEL/ELAN (L2)
47hJochen Liedtke, GMDEUMEL/ELANEUMEL/ELAN (L2)
48hJochen Liedtke, GMDEUMEL/ELANEUMEL/ELAN (L2), ERGOS L3
4AhMBRYesNick RobertsAdaOSAquila (see 7Fh)
MBR, EBRCHS, LBANoFile systemMark AitchisonALFS/THINALFS/THIN advanced lightweight file system for DOS
4ChETH ZürichETH OberonAos (A2) file system (76)
4DhQuantum Software SystemsQNX 4.x, NeutrinoPrimary QNX POSIX volume on disk (77)[6][nb 2]
4EhQuantum Software SystemsQNX 4.x, NeutrinoSecondary QNX POSIX volume on disk (78)[6][nb 2]
4FhQuantum Software SystemsQNX 4.x, NeutrinoTertiary QNX POSIX volume on disk (79)[6][nb 2]
YesETH ZürichETH OberonBoot / native file system (79)
50hETH ZürichETH OberonAlternative native file system (80)
NoOnTrackDisk Manager 4Read-only partition (old)
LynxOSLynx RTOS
Novell
51hNovell
NoOnTrackDisk Manager 4-6Read-write partition (Aux 1)
52hMBRCHSFile systemDigital ResearchCP/M-80CP/M-80
MicroportSystem V/AT, V/386
53hOnTrackDisk Manager 6Auxiliary 3 (WO)
54hOnTrackDisk Manager 6Dynamic Drive Overlay (DDO)
55hMicroHouse / StorageSoftEZ-DriveEZ-Drive, Maxtor, MaxBlast, or DriveGuide INT 13h redirector volume
56hAT&TAT&T MS-DOS 3.xLogical sectored FAT12 or FAT16[nb 3]
MicroHouse / StorageSoftEZ-DriveDisk Manager partition converted to EZ-BIOS
Golden BowVFeatureVFeature partitionned volume
57hMicroHouse / StorageSoftDrivePro
NovellVNDI partition
59hMBR,EBRCHS,LBAYesFile systemYoctoyocOSyocFS
5ChCHSContainerPriamEDISKPriam EDisk Partitioned Volume (see also 45h)
61hMBR CHS Hidden FS Storage DimensionsSpeedStorHidden FAT12 (corresponds to E1h)[nb 6]
63hCHSFile systemAT&T SCO Unix, ISC, UnixWare, AT&T System V/386, ix, MtXinu BSD 4.3 on Mach, GNU HURD
MBR CHS Hidden FS Storage Dimensions SpeedStor Hidden read-only FAT12 (corresponds to E3h)[nb 6]
64h? Storage DimensionsSpeedStorHidden FAT16 (corresponds to E4h)[nb 6]
File systemNovellNetWareNetWare File System 286/2[3]
Secured FS SolomonPC-ARMOUR
65hFile systemNovellNetWareNetWare File System 386
66hFile systemNovellNetWareNetWare File System 386
? NovellNetWareStorage Management Services (SMS)
MBR CHSHidden FS Storage DimensionsSpeedStorHidden read-only FAT16 (corresponds to E6h)[nb 6]
67h? NovellNetWareWolf Mountain
68h? NovellNetWare
69h? NovellNetWare 5
? NovellNetWareNovell Storage Services (NSS)
6ChMBRCHS, LBAx86ContainerDragonFly BSDBSDBSD slice (DragonFly BSD)[14]
70hService DiskSecureDiskSecure multiboot
71hMicrosoft, IBMReserved
72hMBR, EBRCHSx86Policy FSAPTI conformant systemsAPTI alternative FAT12 (CHS, SFN) (corresponds with 01h)
File system NordierUnix V7/x86V7/x86
73hMicrosoft, IBMReserved
74hMBR CHS Hidden FS Storage DimensionsSpeedStorHidden FAT16B (corresponds to F4h)[nb 6]
75hFile system IBMPC/IX[3]
76hStorage DimensionsSpeedStor Hidden read-only FAT16B (corresponds to F6h)[nb 6]
77hFile systemNovellVNDI, M2FS, M2CS
78hYesFile systemGeurt VosXOSL bootloader file system
79hMBR, EBRCHSx86Policy FSAPTI conformant systemsAPTI alternative FAT16 (CHS, SFN) (corresponds with 04h)
7AhMBR, EBRLBAx86Policy FSAPTI conformant systemsAPTI alternative FAT16 (LBA, SFN) (corresponds with 0Eh)
7BhMBR, EBRCHSx86Policy FSAPTI conformant systemsAPTI alternative FAT16B (CHS, SFN) (corresponds with 06h)
7ChMBR, EBRLBAx86Policy FSAPTI conformant systemsAPTI alternative FAT32 (LBA, SFN) (corresponds with 0Ch)
7DhMBR, EBRCHSx86Policy FSAPTI conformant systemsAPTI alternative FAT32 (CHS, SFN) (corresponds with 0Bh)
7EhMBR, EBRNoCacheRomex SoftwarePrimoCacheLevel 2 cache
7FhMBR, EBRAlternative OS Development Partition Standard Reserved for individual or local use and temporary or experimental projects[2]
80hFile systemAndrew TanenbaumMinix 1.1-1.4aMINIX file system (old)
81hFile systemAndrew TanenbaumMinix 1.4b+MINIX file system (corresponds with 41h)
82hNoSwapGNU/LinuxLinuxLinux swap space (corresponds with 42h)
x86ContainerSun MicrosystemsSolaris x86 (for Sun disklabels up to 2005) (see BFh)
83hYesFile systemGNU/LinuxLinuxAny native Linux file system (see 93h, corresponds with 43h)
84hNoHibernationMicrosoft?APM hibernation (suspend to disk, S2D)[5][7][15]
Hidden FSIBMOS/2Hidden C: (FAT16)(corresponds to either 04h or 06h)
HibernationIntelRapid Start technologyRapid Start hibernation data[16] (possibly iFFS; possibly used for Intel SRT SSD cache as well)
85hNo, AAPContainerGNU/LinuxLinuxLinux extended[17] (corresponds with 05h)
86hFile systemMicrosoftWindows NT 4 ServerFault-tolerant FAT16B mirrored volume set (see B6h and C6h, corresponds with 06h)[4][5]
ServiceGNU/LinuxLinuxLinux RAID superblock with auto-detect (old) (see FDh)
87hFile systemMicrosoftWindows NT 4 ServerFault-tolerant HPFS/NTFS mirrored volume set (see B7h and C7h, corresponds with 07h)[4][5]
88hServiceGNU/LinuxLinux plaintext partition table
8AhServiceMartin KiewitzAiR-BOOTLinux kernel image
8BhFile systemMicrosoftWindows NT 4 ServerLegacy fault-tolerant FAT32 mirrored volume set (see BBh and CBh, corresponds with 0Bh)[4]
8ChFile systemMicrosoftWindows NT 4 ServerLegacy fault-tolerant FAT32 mirrored volume set (see BCh and CCh, corresponds with 0Ch)[4]
8DhMBR, EBRCHS, LBAx86, 68000, 8080/Z80Hidden FSFreeDOSFree FDISKHidden FAT12 (corresponds with 01h)[nb 7]
8EhContainer GNU/LinuxLinuxLinux LVM since 1999 (see FEh)
90hMBR, EBRCHS, LBAx86, 68000, 8080/Z80Hidden FSFreeDOSFree FDISKHidden FAT16 (corresponds with 04h)[nb 7]
91hMBR, EBRCHS, LBANo, AAPHidden containerFreeDOSFree FDISKHidden extended partition with CHS addressing (corresponds with 05h)[nb 7]
92hMBR, EBRCHS, LBAx86Hidden FSFreeDOSFree FDISKHidden FAT16B (corresponds with 06h)[nb 7]
93hFile systemAndrew S. Tanenbaum AmoebaAmoeba native file system
Hidden FSLinuxHidden Linux file system (see 83h)
94hService Andrew S. Tanenbaum AmoebaAmoeba bad block table
95hFile system MITEXOPCEXOPC native
96hFile system? CHRPISO-9660 file system
97hMBR, EBRCHS, LBAx86Hidden FSFreeDOSFree FDISKHidden FAT32 (corresponds with 0Bh)[nb 7]
98hMBR, EBRLBAx86Hidden FSFreeDOSFree FDISKHidden FAT32 (corresponds with 0Ch)[nb 7]
MBRCHS, LBAx86Service FSDatalightROM-DOSService partition (bootable FAT) ROM-DOS SuperBoot (see 12h)
MBRCHS, LBAx86Service FSIntel? Service partition (bootable FAT)[7] (see 12h)
99hFile system? ? Early Unix
9AhMBR, EBRLBAx86Hidden FSFreeDOSFree FDISKHidden FAT16 (corresponds with 0Eh)[nb 7]
9BhMBR, EBRLBANo, AAPHidden containerFreeDOSFree FDISKHidden extended partition with LBA (corresponds with 0Fh)[nb 7]
9EhFile system Andy ValenciaVSTa
File system Andy ValenciaForthOSForthOS (eForth port)[18]
9Fh?? BSD/OS 3.0+, BSDI (see B7h and B8h)
A0hMBRService FSHewlett Packard? Diagnostic partition for HP laptops[7]
HibernationPhoenix, IBM, Toshiba, Sony? Hibernate partition[5]
A1h? Hewlett PackardHP Volume Expansion [nb 5]
HibernationPhoenix, NEC? Hibernate partition
A2hMBRCHS, LBAARMImageAlteraCyclone VHard Processor System (HPS) ARM preloader[19]
A3h? Hewlett PackardHP Volume Expansion [nb 5]
A4h? Hewlett PackardHP Volume Expansion [nb 5]
A5hMBRContainerFreeBSDBSDBSD slice (BSD/386, 386BSD, NetBSD (before 1998-02-19), FreeBSD)[20]
A6h? Hewlett PackardHP Volume Expansion [nb 5]
MBRContainerOpenBSDOpenBSDOpenBSD slice
A7h386File systemNeXTNeXTSTEP
A8hFile systemAppleDarwin, Mac OS XApple Darwin, Mac OS X UFS[nb 8]
A9hMBRContainerNetBSDNetBSDNetBSD slice[21]
AAhMBRCHS?File systemOlivettiMS-DOSOlivetti MS-DOS FAT12 (1.44 MB) (corresponds with 06h)
ABhYesService AppleDarwin, Mac OS XApple Darwin, Mac OS X boot[nb 8]
File system Stanislav KarchebnyGO! OSGO!
AChYesService AppleDarwin, Mac OS XApple RAID, Mac OS X RAID[nb 8]
ADhFile systemBen Avison, AcornRISC OSADFS / FileCore format
AEhx86File systemFrank BarrusShagOSShagOS file system
AFh? File system AppleMac OS X HFS and HFS+[nb 8]
NoSwapFrank BarrusShagOSShagOS swap
B0hMBRCHS, LBAx86BlockerStar-ToolsBoot-StarBoot-Star dummy partition
B1h? Hewlett PackardHP Volume Expansion [nb 5]
File system QNX Software SystemsQNX 6.xQNX Neutrino power-safe file system[nb 2]
B2hFile system QNX Software SystemsQNX 6.xQNX Neutrino power-safe file system[nb 2]
B3h? Hewlett PackardHP Volume Expansion [nb 5]
File system QNX Software SystemsQNX 6.xQNX Neutrino power-safe file system[nb 2]
B4h? Hewlett PackardHP Volume Expansion [nb 5]
B6h? Hewlett PackardHP Volume Expansion [nb 5]
EBRFile systemMicrosoftWindows NT 4 ServerCorrupted fault-tolerant FAT16B mirrored master volume (see C6h and 86h, corresponds with 06h)
B7hFile systemBSDI (before 3.0)BSDI native file system / swap (see B8h and 9Fh)
EBRFile systemMicrosoftWindows NT 4 ServerCorrupted fault-tolerant HPFS/NTFS mirrored master volume (see C7h and 87h, corresponds with 07h)
B8hFile systemBSDI (before 3.0)BSDI swap / native file system (see B7h and 9Fh)
BBhHidden FSPhysTechSoft, Acronis, SWsoftBootWizard, OS SelectorPTS BootWizard 4 / OS Selector 5 for hidden partitions other than 01h, 04h, 06h, 07h, 0Bh, 0Ch, 0Eh and unformatted partitions
MBRService FS AcronisAcronis True ImageOEM Secure Zone (corresponds to BCh)
EBRFile system MicrosoftWindows NT 4 ServerCorrupted fault-tolerant FAT32 mirrored master volume (see CBh and 8Bh, corresponds with 0Bh)
BChEBRFile system MicrosoftWindows NT 4 ServerCorrupted fault-tolerant FAT32 mirrored master volume (see CCh and 8Ch, corresponds with 0Ch)
MBRLBAService FS AcronisAcronis True ImageAcronis Secure Zone
MBR, EBRService FS Paragon Software GroupBackup CapsuleBackup Capsule
BDhFile system ? BonnyDOS/286
BEhYesFile system Sun MicrosystemsSolaris 8Solaris 8 boot
BFhx86ContainerSun MicrosystemsSolarisSolaris x86 (for Sun disklabels, since 2005) (see 82h)
C0hMBRCHS, LBAx86Secured containerNovell, IMSDR-DOS, Multiuser DOS, REAL/32Secured FAT partition (smaller than 32 MB)[nb 9][nb 10]
C1hMBR, EBRCHS, LBAx86Secured FSDigital ResearchDR DOS 6.0+Secured FAT12 (corresponds with 01h)[nb 9]
C2hYesHidden FSBlueSky InnovationsPower BootHidden Linux native file system
C3hNoHidden swapBlueSky InnovationsPower BootHidden Linux swap
C4hMBR, EBRCHS, LBAx86Secured FSDigital ResearchDR DOS 6.0+Secured FAT16 (corresponds with 04h)[nb 9]
C5hMBR, EBRCHS, LBANo, AAPSecured containerDigital ResearchDR DOS 6.0+Secured extended partition with CHS addressing (corresponds with 05h)[nb 9]
C6hMBR, EBRCHS, LBAx86Secured FSDigital ResearchDR DOS 6.0+Secured FAT16B (corresponds with 06h)[nb 9]
EBRFile system MicrosoftWindows NT 4 ServerCorrupted fault-tolerant FAT16B mirrored slave volume (see B6h and 86h, corresponds with 06h)
C7hMBRYesFile system SyrinxSyrinx boot
EBRFile system MicrosoftWindows NT 4 ServerCorrupted fault-tolerant HPFS/NTFS mirrored slave volume (see B7h and 87h, corresponds with 07h)
C8h? Reserved for DR-DOS since 1997
C9h? Reserved for DR-DOS since 1997
CAh? Reserved for DR-DOS since 1997
CBhMBR, EBRCHS, LBAx86Secured FSCalderaDR-DOS 7.0xSecured FAT32 (corresponds with 0Bh)[nb 9]
EBRFile system MicrosoftWindows NT 4 ServerCorrupted fault-tolerant FAT32 mirrored slave volume (see BBh and 8Bh, corresponds with 0Bh)
CChMBR, EBRLBAx86Secured FSCalderaDR-DOS 7.0xSecured FAT32 (corresponds with 0Ch)[nb 9]
EBRFile system MicrosoftWindows NT 4 ServerCorrupted fault-tolerant FAT32 mirrored slave volume (see BCh and 8Ch, corresponds with 0Ch)
CDhNoService Convergent Technologies, UnisysCTOSMemory dump (see DDh and DBh)
CEhMBR, EBRLBAx86Secured FSCalderaDR-DOS 7.0xSecured FAT16B (corresponds with 0Eh)[nb 9]
CFhMBR, EBRLBANo, AAPSecured containerCalderaDR-DOS 7.0xSecured extended partition with LBA (corresponds with 0Fh)[nb 9]
D0hMBRCHS, LBA386Secured containerNovell, IMSMultiuser DOS, REAL/32Secured FAT partition (larger than 32 MB)[nb 11][nb 10]
D1hMBR, EBRCHS386Secured FSNovellMultiuser DOSSecured FAT12 (corresponds with 01h)[nb 11]
D4hMBR, EBRCHS386Secured FSNovellMultiuser DOSSecured FAT16 (corresponds with 04h)[nb 11]
D5hMBR, EBRCHSNoSecured containerNovellMultiuser DOSSecured extended partition with CHS addressing (corresponds with 05h)[nb 11]
D6hMBR, EBRCHS386Secured FSNovellMultiuser DOSSecured FAT16B (corresponds with 06h)[nb 11]
D8hMBRCHSFile systemDigital ResearchCP/M-86 CP/M-86 (see DBh)
DAhNoService John HardinNon-file system data
Secured FS DataPowerPowercopy BackupShielded disk
DBhMBRCHSx86File systemDigital ResearchCP/M-86, Concurrent CP/M-86, Concurrent DOS[22] (see D8h)[3]
? Convergent Technologies, UnisysCTOS? (see CDh and DDh)
x86Service KDG TelemetryD800boot image for x86 supervisor CPU (SCPU) module
MBRCHS, LBAx86Service FSDellDRMKFAT32 system restore partition (DSR) (see DEh)
DDhNoService Convergent Technologies, UnisysCTOSHidden memory dump (see CDh and DBh)
DEhMBRCHS, LBAx86Hidden FSDellFAT16 utility/diagnostic partition[5][7][23]
DFh? Data GeneralDG/UXDG/UX virtual disk manager
MBRBlockerTeraByte UnlimitedBootItEMBRM
? ? Aviion
E0hFile systemSTMicroelectronicsST AVFS
E1hMBR CHS File systemStorage DimensionsSpeedStorFAT12 (≤16 MB) (corresponds to 01h)[nb 6]
E3hFile systemStorage DimensionsSpeedStorRead-only FAT12 (corresponds to E1h)[nb 6]
E4hMBR CHS File systemStorage DimensionsSpeedStorFAT16 (≤32 MB) (corresponds to 04h)[nb 6]
E5hMBRCHSx86File systemTandyTandy MS-DOSLogical sectored FAT12 or FAT16[nb 3]
E6hFile System Storage DimensionsSpeedStorRead-only FAT16 (corresponds to E4h)[nb 6]
E8hMBR,EBRCHS, LBANoService LinuxLUKSLinux Unified Key Setup[24]
EBh386File systemBe Inc.BeOS, HaikuBFS (see 2Ah and 2Bh)
EChFile systemRobert SzeleneySkyOSSkyFS
EDhMBR, EBRCHS, LBAx86Service Matthias R. PaulSprytixEDC loader
MBRCHS, LBAx86Hewlett PackardEFI Was proposed for GPT hybrid MBR[nb 12]
EEhMBRNoBlockerMicrosoftEFIGPT protective MBR[1][5] (see EFh)
EFhMBRService FS IntelEFIEFI system partition. Can be a FAT12, FAT16, FAT32 (or other) file system[5] (see EEh)
F0hCHSService LinuxPA-RISC Linux boot loader; must reside in first physical 2 GB
F2hMBRCHSx86File systemSperry IT, Unisys, Digital ResearchSperry IT MS-DOS 3.x, Unisys MS-DOS 3.3, Digital Research DOS Plus 2.1Logical sectored FAT12 or FAT16[nb 3] secondary partition
F4hMBR CHS File systemStorage DimensionsSpeedStorFAT16B (corresponds to 06h)[nb 6]
File system? PrologueSingle volume partition for NGF or TwinFS
F5hContainer? PrologueMD0-MD9 multi volume partition for NGF or TwinFS
F6hMBRFile system Storage DimensionsSpeedStorRead-only FAT16B (corresponds to F4h)[nb 6]
F7hFile systemNatalia PortilloO.S.G.EFAT
File systemDDRdriveX1Solid State file system
F8hMBRServiceArmArm EBBR 1.0 [25]Protective partition for the area containing system firmware
F9hCache ALC PressLinuxpCache ext2/ext3 persistent cache[26]
FBhNoFile systemVMwareVMware ESXVMware VMFS file system partition
FChNoSwapVMwareVMware ESXVMware swap / VMKCORE kernel dump partition
FDhServiceGNU/LinuxLinuxLinux RAID superblock with auto-detect (see 86h)
FEh ServiceIBMPS/2PS/2 IML partition[5][7]
MBRCHS, LBAx86Service FSIBMPS/2PS/2 recovery partition (FAT12 reference disk floppy image), (corresponds with 01h if activated, all other partitions +10h then)[5]
ServiceGNU/LinuxLinuxOld Linux LVM (see 8Eh)
FFhMBRCHSNoService MicrosoftXENIXXENIX bad block table (see 02h and 03h)[3]

See also

Notes
  1. MS-DOS/PC DOS 2.0-3.1 cannot cope with hard disk partitions outside the first 32 MB of the disk. Therefore, FAT12 and FAT16 volumes in primary partitions physically residing outside this area must not use partition IDs 01h and 04h, even if they were otherwise small enough to be recognized by these DOS versions. In order to hide these volumes from these DOS issues 06h can be used instead. DOS distinguishes FAT types by their number of clusters, not by their partition ID, therefore, this does not cause any problems for DOS 3.31 and higher except for a possibly wrong file system type display in FDISK.
  2. QNX partition IDs 07h, 08h, 09h, 4Dh (77), 4Eh (78), 4Fh (79), as well as B1h (177), B2h (178) and B3h (179).
  3. Known partition IDs for logical sectored FATs include: 08h (Commodore MS-DOS 3.x), 11h (Leading Edge MS-DOS 3.x), 14h (AST MS-DOS 3.x), 24h (NEC MS-DOS 3.30), 56h (AT&T MS-DOS 3.x), E5h (Tandy MS-DOS), F2h (Sperry IT MS-DOS 3.x, Unisys MS-DOS 3.3 — also used by Digital Research DOS Plus 2.1). While non-standard and sub-optimal these FAT variants are perfectly valid according to the specifications of the file system itself, although default issues of MS-DOS / PC DOS 3.x were not able to cope with them. Most of these vendor specific FAT12 and FAT16 variants can be mounted by more flexible file system implementations in operating systems such as DR-DOS simply by changing the partition ID to one of the recognized types. Also, if they no longer need to be recognized by their original operating systems, existing partitions can be "converted" into FAT12 and FAT16 volumes compliant with versions of MS-DOS/PC DOS like 5.0-6.3, which do not support logical sector sizes different from 512 bytes, by switching to a BPB with 32-bit entry for the number of sectors, as introduced since DOS 3.31, keeping the cluster size and reducing the logical sector size in the BPB down to 512 bytes, while at the same time increasing the counts of logical sectors per cluster, reserved logical sectors, total logical sectors, and logical sectors per FAT by the same factor.
  4. Used by OS/2 Boot Manager: 0Ah, 11h, 14h, 15h, 16h, 17h, 1Bh, 1Ch, 1Eh, 1Fh.
  5. HP Volume Expansion is a variant of SpeedStor and uses partition IDs 21h, A1h, A3h, A4h, A6h, B1h, B3h, B4h, and B6h.
  6. SpeedStor is an extended storage support driver for DOS for IBM PC/XT (v. 6.03) and IBM PC/AT (v. 6.5). Its custom partition types are E1h, E4h and F4h which can be marked read-only (becoming E3h, E6h, F6h), hidden (61h, 64h, 74h) or hidden read-only (63h, 66h, 76h).
  7. Used by Free FDISK of FreeDOS: 8Dh, 90h, 91h, 92h, 97h, 98h, 9Ah, 9Bh.
  8. Apple Mac OS X uses partition IDs A8h, ABh, ACh, and AFh.
  9. Versions of DR DOS 6.0 and higher use several of these partition IDs for secured FAT partitions with single-user security: C0h, C1h, C4h, C5h, C6h, CBh, CCh, CEh, CFh.
  10. Versions of IMS REAL/32 use partition IDs C0h and D0h for multi-user security.
  11. Versions of Multiuser DOS use these partition IDs for secured FAT partitions with multi-user security: D0h, D1h, D4h, D5h, D6h.
  12. Was suggested in now-superseded T13 EDD 4 proposal e09127r1 (2009). The successor e09127r3 (2010) now recommends to use a normal partition type (the one that a legacy OS would see) instead of this special value.

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