Commodore 4040

The Commodore 4040 is the replacement for the previous models 2040 (U.S.) and 3040 (Europe). It's a dual-drive 5¼" floppy disk subsystem for Commodore Business Machines. It uses a wide-case form, and uses the parallel IEEE-488 interface common to Commodore PET/CBM computers.

Commodore 4040

Front view of the Commodore 4040 dual disk drive.
Manufacturer	Commodore Business Machines, Inc.
Type	Floppy disk drive
Media	2 × 5¼" double-sided floppy disk SS SD[1]
Operating system	CBM DOS 2.6[1]
CPU	MOS 6502 & MOS 6504 @ 1 MHz
Memory	4 kB SRAM (8 × 2114), 10kB ROM (1 × 6332, 1 × 6316)[2]
Storage	170 kB per disk[1]
Connectivity	Parallel IEEE-488[1]
Backward compatibility	Commodore PET/CBM, 4000-series, 8000-series, B128
Predecessor	Commodore 2040 & 3040
Successor	Commodore 8050 & 8250
Related articles	Commodore 2031 & 1541

These drive models use a single-density, single-side floppy data storage format similar to that used by the Commodore 1540 & 1541 drives, but with a slightly different data marker indicating which model originally formatted the disk. The low-level disk format is similar enough to allow reading between models, but different enough that one series of drive models cannot reliably write to disks formatted with one of the other model series. A difference of one extra 'header' byte is what causes this write incompatibility.

The Group Coded Recording (GCR) scheme of binary encoding is used to store data on the magnetic disk medium. The drive also uses variable bit-clock to enable increased data density on a standard single-density floppy disk. It is a form of constant bit-density recording done by gradually increasing the clock rate (zone constant angular velocity, ZCAV) and storing more physical sectors on the outer tracks than on the inner ones (zone bit recording, ZBR). Starting with the Commodore 2040 drive, this enabled Commodore to fit 170 kB on a standard single-sided single-density 5.25" floppy.