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Questions tagged [floppy-disk]

Use, restoration and imaging of floppy disks; low-level formats of floppy media. Consider [file-system] for high-level formatting.

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On the TRS-80 models I and III when is the directory track number written in the third byte of sector zero, and when in the second byte?

Earlier I had found that many but not all TRS-80 Model I and Model III disks begin with the three bytes 00h FEh 11h. This is the beginning of the boot sector where the CPU interprets it as a NOP ...
hippietrail's user avatar
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5 votes
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What was the last 5.25-inch floppy disk drive manufactured?

Assuming that no manufacturer of removable-media disk-drives is still manufacturing disk-drives for 5¼-inch floppy disks - what was the last drive model manufactured / sold and who was the ...
Micropolis's user avatar
4 votes
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What does a "DK" signature mean at the start of track 0 sector 3 of a Dragon 32/64 floppy disk?

I'm looking at disk image files for the Dragon 32 / Dragon 64 computers. The Dragon computers are very similar to the Tandy TRS-80 Color Computer "CoCo" but are not clones and are not the ...
hippietrail's user avatar
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4 votes
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What computer (possibly a PC compatible) rendered a spinning floppy disk on the screen on a boot error?

I recall seeing an IBM PC compatible or similar system many years ago in a business environment that had a distinctive boot error screen. The system showed a spinning floppy disk on the screen, ...
bwDraco's user avatar
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2 votes
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Transfer a TeleDisk image of a 5.25 disk to a 3.5 disk

I am trying to power on an old Siemens PG675. It need a 5.25 disk but unfortunately it is missing. I found a TeleDisk image (.TD0) of this disk, and I would like to transfer it to a 3.5 floppy disk (I ...
Ucotecnico's user avatar
1 vote
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How can I read/write/format 5.25" 40-track MFM floppies on modern systems?

I've got a Fujitsu FM-7 with an external 5.25" floppy drive unit; it has a pair of 40-track, double-sided, double-density¹ drives. These use a fairly common low-level track format: the standard "IBM ...
cjs's user avatar
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