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HD disks: 512 bytes/sector, 22 sector/track, 2 track/cyl, 80 cyl/disk.DD disks: 512 bytes/sector, 11 sector/track, 2 track/cyl, 80 cyl/disk.The geometry of an Amiga floppy disk is as follows: Double density (DD) disks have 11 sectors per MFM track, high density (HD) disks have 22 sectors. Each cylinder has 2 MFM tracks, one on each side of the disk. There are 80 cylinders on an Amiga floppy disk. Characteristics of AmigaDOS Floppy Disks Īmiga uses MFM encoding/decoding by default when handling floppy disks. DiskDoctor in fact changed autostart disks bootblocks into standard AmigaDOS-based ones, renaming a disk with "Lazarus" namedisk, and made the autostart disk unusable. The idea to create non-standard autobootable disks was born in a primitive attempt to prevent copy of such disks and to avoid the loading and launch of Amiga DOS, in order to directly access the Amiga graphic, audio and memory chipsets. OFS is very good for repairing the filesystem in the event of a problem, although the so-called DiskDoctor provided by Commodore quickly earned the name DiskDestroyer, because it could not repair No-DOS type autostart disks provided by third-party software manufacturers as bootable disks for games.
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It received the nickname of "Old" or "Original" File System when Fast File System was released with AmigaOS 1.3. Originally known as the Amiga File System, it came from the filesystem of TRIPOS, which formed the basis of the first versions of AmigaDOS. It wasn't very suitable for anything except floppy disks, and it was soon replaced. Even though it used 512-byte blocks, it reserved the first small portion of each block for metadata, leaving an actual data block capacity of 488 bytes per block. On the Amiga, the Old File System was the filesystem for AmigaOS before the Amiga Fast File System. Please help improve this article by introducing citations to additional sources.įind sources: "Amiga Old File System" – news Relevant discussion may be found on the talk page. This article relies largely or entirely on a single source.
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