DustyShinigami wrote on 2025-12-24, 16:03:
I have some questions concerning ImageDisk’s formatting. I’m not particularly clued up on the technicalities of floppy disks, but it asks to specify the Interleave. The Sides I get. Double-step, Interleave, specifying the Sectors/Tracks, and Data Rate Type, I’m not sure about. I left them at defaults. But are there specific values I should setsfor a 3.5” 1.44 HD disks? Thanks.
Sorry, I was away for a month and didn't check here till now...
ImageDisk was designed to assist in recovery of floppy disk, most specifically those from older (pre-PC) systems.
I tried to set reasonable defaults - and it does generally work quite well for "casual" users, but to get into the more complex stuff, you really do have to "know what you are doing" - If you are trying to recovert/restore irreplaceable media, I really think you should spend the time/research to not do irrecoverable damage!
Much of this is covered to some extent in the document or help... but here goes:
Interleave - Historically systems were not fast enough to handle the next (sequentiak) on an already spinning disk. To avoid slowdown by having to wait a whole revolution, most disk are written with "interleave" this means the sectors are "spaced out" by recording in non-sequential order - eg: instead of 1,2,3,4,5 the disk might be 1,3,5,2,4 which allows an extra sector time (on the spinning disk) before the next logically sequential sector comes up. Spacing can be more than 1sector which is (interleve factor)
Tracks are "rings" of data as written and read by the head as it is positioned to a certain ring. Most disks have either 40 or 80 tracks but some are different (eg: 8" disks usually have 77 tracks, original 5.25" spec. was for 35 tracks)
Some disks can do more than one ttype of media - the HD 5.25" disks in a PC have 80 tracks, but they can access non-HD disks which were written on 40-track drivces, hench "double stepping".
Sectors are blocks of data on the disk within a track ,are numbered, some start at 0, some start at 1 (and some really odd ones start at >1), same with tracks.
Data-rate is how fast the floppy controller transfers data bits to the drive - this depends on the drive/media type. ImageDisk will figure this out as it reads a disk - best to just write down the parameters applicable to different drives & media. This will normally be either 250kbps for certain smaller drives (SD, DD) and 500kbps for HD drives - but you really have to know what you are doing if you want to mess with this (and most of the prameters)
- Dave ; https://dunfield.themindfactory.com ; "Daves Old Computers" ; SW dev addict best known:
ImageDisk: rd/wr ANY floppy PChardware can ; Micro-C: compiler for DOS+ManySmallCPU ; DDLINK: simple/small FileTrans(w/o netSW)via Lan/Lpt/Serial