Questions tagged [floppy-drive]

Floppy drives and accessing floppy disks from historical computers, ranging from 8″ down to 3.25″ and other non-standard sizes.

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5
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1answer
368 views

3.5″ floppy drive shown as 5.25″ in Windows 98 SE

I have an old PC from the 90s. When I boot DOS from floppy, everything works fine. I have just installed Windows 98 SE and for some reason, the 3.5 inch floppy drive is showing as 5.25 inch drive. It ...
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2answers
139 views

How to use IBM SaveDskF floppy format on modern machine

Is there a way to write IBM SaveDskF disk images to a floppy on a modern machine? The floppy drive is connected via USB. Some comment somewhere said to use WinImage, but I tried that and it said the ...
2
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1answer
155 views

“Restoring” a 1986 Compaq Portable II (Cabling question)

I am in possession of a working 1986 Compaq Portable II. However, I couldn't find a 5.25" floppy with the proper version of DOS on it to actually make the computer, ya know, work. I've since ...
7
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1answer
1k views

I can't read DS 1MB floppy disks

Using an USB external floppy drive, I've been able to use my Mac to back up files from a big box of 3.5 inch floppies (800K, HD 1.4MB). But I cannot even read my DS 1MB floppies using either the ...
6
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2answers
125 views

Reading data of floppies from a ZX Spectrum Swift disk

Back in the day we had a sixword swiftdisk we were ahead of the game on our speccy allowing us to us 3.5inch floppy disks. See: https://www.worthpoint.com/worthopedia/swift-disc-interface-zx-spectrum-...
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3answers
896 views

Why does an Amiga's floppy drive keep clicking?

I seem to remember that an A500 (probably A600 too) would keep emitting a click from the floppy drive. I think this was only with no disk in the drive, but I'm not sure. What was that?
3
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2answers
210 views

Did any 5.25" floppy drives not based on the Apple Disk II offer quarter-track control

Unlike many drives, the Apple Disk II has inputs that control the individual head stepper coils. These are commonly described as advancing by half-tracks, since advancing a full track requires ...
3
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2answers
125 views

How can I format a higher capacity 3 inch disc on a regular CPC6128?

A standard Amstrad 3 inch disc can be formatted to CP/M Data format on the machine: single sided, single track, 40 tracks, 9 sectors/track, 512-byte sectors, no reserved tracks, 1k blocks, 2 directory ...
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3answers
579 views

How can I boot or extract files from an IBM PS/1 with a DoubleSpace-compressed hard drive?

I’m trying to boot an old IBM PS/1, mostly with the intention to read out its hard disk. I realized quickly that the original floppy disk drive was broken, so I replaced it with a Gotek floppy ...
4
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3answers
269 views

What can be done with a USR file on the Commodore 1541 disk drive?

The USR filetype on the Commodore VC 1541 disk drive is a less common sequential file that according to some book sources can be executed as a program directly on the drive. The drive has its own 6502 ...
7
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1answer
191 views

Could a double-sided Commodore disk be written to be used as a “flippy” on a 1541, without requiring flipping on a 1571?

Although the 1571 is capable of reading and writing both sides of a disk, accesses to the second side using the second head will be performed with the drive spinning in opposite direction from how it ...
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0answers
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Looking for a timeline or overview of implementations/inventions in the electromechanical part of 5.25" floppy drives [closed]

It's not so much about going from full-height drives to half-height drives, but about finer details. Disk rotation drive - when and how was the belt replaced with a direct drive and a flat motor? Who ...
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3answers
233 views

I need to find a controller card for an apple II 5.25 inch floppy drive, the 20 pin connector wont work on the 34 pin controller card i have

I cant find any adapters or secondary connectors, can anybody get me a link to a working floppy controller card that works or possibly a connector that goes from 20 pin male to 34 pin female? i have ...
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3answers
3k views

Connecting old Floppy Drive to modern computer

I need a way to write on floppy disks from my modern PC (motherboard GIGABYTE z730p). I own a Panasonic JU-257A606P I took from an old machine of mine, and before buying a USB floppy drive I wanted to ...
3
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3answers
346 views

Where can I find a 26-pin flex flat cable for the floppy drive in a Toshiba T19x0 laptop?

I was trying to take apart a Toshiba T1950ct laptop to replace the slim floppy drive’s belt. Unfortunately, I broke the delicate flat flex cable (ffc), which is a non-standard 26-wire floppy cable. ...
1
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1answer
130 views

Help in finding signals on schematics

Where are the missing signals that I can't pair between amiga external drive connector and gotek drive? I'd like to connect GOTEK to CDTV, there is a way to do it directly (caddy died), but I can't ...
6
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2answers
252 views

How can the number of cylinders be different from the number of tracks?

In the IBM PC 5150 documentation, it is stated that the floppy drive has 40 tracks, 8 sectors/track and 512 bytes/sectors, for a total of 163 840 bytes of data. It makes sense, 40x8x512 = 163 840 ...
13
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4answers
2k views

Can special tools recover data from floppy disks when Windows Explorer fails to do so?

I have many 1.44MB floppies 20 years old or older. My FDD, which I just bought online and received recently, cannot read them. The FDD can often display the contents of a floppy, but not successfully ...
8
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1answer
457 views

Was sector size under software control on the original IBM PC floppy drive controller?

The original IBM PC used a 5.25" floppy disk format of two sides, 40 tracks, 9 sectors per track, 512 bytes per sector, for 360K per disk. As I understand it, a significant amount of disk space ...
5
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1answer
235 views

How to get GOTEK to work with CDTV?

I'm trying to connect Gotek drive to my CDTV using external caddy (amitek). The drive has 3 digit LED display, after boot i can see F-F. When I insert Flash drive it detects images on it, I can ...
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2answers
641 views

How to get into Apple BASIC prompt on an Apple IIc?

I just picked up a used Apple IIc. For some reason all I get when I boot is Check Disk Drive on the screen, even with a bootable disk in the internal drive: I cannot even get the system to read the ...
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2answers
461 views

How long should I expect the Apple IIc self test to run?

I purchased a vintage Apple IIc computer and I want to make sure there are no failing components. I booted up the computer while pressing both Apple keys (open and close) at the same time. The ...
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1answer
156 views

What did “double track” meaning in relation to floppy disks?

I mostly used 3½″ floppies back in the day but I also used 5¼″ floppies to some extent on Apple II's and TRS-80's. I was never exposed to 3″ floppy disks as used mainly on Amstrad microcomputers and ...
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0answers
164 views

Algorithm to properly format 360k 5.25" diskette on 1.2M drive?

This is a low level tech question, as I develop the driver for the FDC at its command set level. Having reviewed a number of sources I can not find the algorithm of how to format the 360k diskette ...
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5answers
2k views

How are blocks stacked on a floppy or older HD

I tried to understand how to read a floppy image format (.sdk). The format is based on CP/M 2.2 filesystem. I've lost track, and I think it's my third attempt. Now I am looking more into what these ...
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3answers
4k views

Could you manually eject a floppy quick enough to prevent data loss?

I have the vague recollection of "Panic Ejecting" floppy disks by lifting the latch on the drive after immediately regretting a command I had typed. At the time, I was young, impulsive, and blessed ...
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2answers
339 views

Mismatched floppy disk/drive reading and writing, what should one keep in mind?

Mismatched disk/drive refers to, for example, reading/writing a 720K disk with a 1.44M drive. Don't forget LS-120 and LS-240 SuperDisk drives, they can use standard floppies too. What can and can't ...
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2answers
368 views

Can a 1,44MB or 720K PC floppy drive be made to work with an Apple II family?

I am restoring a couple of Apple II machines. I would like to add an external 3.5" floppy drive, but they are prohibitively expensive. I have tons of older PC floppy drives and I wonder if they could ...
3
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1answer
193 views

Amstrad CPC6128 disc starting to fail?

I have an Amstrad CPC6128. I replaced and serviced the drive belt a few years ago, but now I am getting some disc errors. The drive is making noise but a few discs are reporting 'disc missing'. ...
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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 ...
8
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2answers
224 views

How much control of TRS-80 Model III disk drives was possible from its Cassette (ROM) BASIC?

How much control over the TRS-80 Model III's floppy drive controller can be effected via relatively simple commands, typed into its built-in Cassette BASIC? My understanding is that general usage of ...
16
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1answer
2k views

Can I use all features of a Commodore 1571 external drive from a C64?

I know that the Commodore 1571 drive works perfectly well with a C64, since the 1571 will detect it is connected to a C64, and will enter 1541 emulation mode. After which, the 1571 just behaves as a ...
6
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0answers
158 views

How did the Tandy 1000 select its drives?

I am trying to use some Tandy 1000 drives with a SuperCard Pro and have encountered some anomalies using them as "standard" floppy drives. It appears that with the original (or at least, working and ...
9
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1answer
1k views

Were single-sided floppy drives really more tolerant of rough handling?

The Osborne 1 was a luggable computer that contained a pair of 5.25-inch floppy drives. According to https://en.wikipedia.org/wiki/Osborne_1 Adam Osborne decided to use single-sided disk drives out ...
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3answers
626 views

Bad floppy drive in T1910CS 486 laptop

I've recently picked up a Toshiba T1910CS 486 laptop. It's in OK shape, with a 500MB hard drive and DOS installed. I also ordered a USB floppy disk drive and some floppy disks so that I could install ...
4
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2answers
489 views

How did IBM's “Mag Card” drive and magnetic media work?

In the 1970's IBM popularized an early word processing solution using their popular Selectric typewriter line and something called "Mag Card". This video demonstrates the system in operation. The ...
9
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1answer
429 views

What is the C64 disk drive “Jiffy” protocol?

There seems to be something called the "Jiffy protocol" used for some fast load systems. I know of the JiffyDOS product, which seems to require replacing ROMs in both the C64 and the drive, but it ...
9
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2answers
832 views

What are the most common Apple II disk image formats and what hardware disk drive emulators can use them?

Archive.org has plenty of Apple II disk images, such as this DOS 3.3 image which is a .dsk file. I also see .nib and .d13 files, e.g. in this ASIMOV LISP collection. There seem to be further formats ...
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4answers
3k views

Is there any way today to recover/dump 2M disks?

2M disks where formatted using 2MGUI to increase 3"1/2 & 5"1/4 DD/HD/ED disks' capacity. Is there any way today to recover/dump these disks to a file with modern hardware? Specially the 5"1/4 ...
6
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3answers
345 views

What is the floppy disk port pinout for the NEC PC-8001mkII?

I have a NEC PC-8001mkII computer (sometimes incorrectly called a "PC-8001mk2") which has a built-in disk controller for PC-8000-series double-density 5.25" drives. (The English and Japanese Wikipedia ...
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5answers
8k views

Why did the Apple IIe make a hideous noise if you inserted the disk upside down?

When I began high school in 1987 all the computers in the lab were Apple IIe desktop computers. A question has haunted me since then: if you inserted a floppy disk "upside down" the Apple IIe would ...
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6answers
6k views

Did any laptop computers have a built-in 5¼-inch floppy drive?

In the early era of “portable” or luggable computers, such as the mains powered Osborne 1 and the Compaq Portable, 5¼-inch floppy drives were the standard storage medium. When battery-powered laptops ...
2
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1answer
255 views

Support for 5.25-inch floppy drives on IBM Thinkcentre 8187 KUR

I have an IBM ThinkCentre 8187KUR desktop system. It has a bay for 5.25-inch floppies but no support in the BIOS. My question is, can I put in a PCI card to support floppy drive access and run the 5....
6
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2answers
476 views

How does a HD floppy drive react to an ED disk?

If one inserts an ED disk into a floppy drive, which supports sizes only up to HD, how does it cope with ED?
29
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4answers
1k views

Absolute maximum number of nibbles on an Apple II floppy disk track?

The Apple 2's disk drive controller and 5¼" floppy disks have the following metrics: The disks is spun at (roughly) 300 RPM (Revolutions per Minute), which means it takes = 1000 ms/sec / (300 RPM / ...