How can a floppy be a PC 720k disk and an Amiga 880k disk at the same time? - Page 2

Amiga1992 · 02 July 2002, 04:29

I don't know, it just didn't work here! Strange thing...

Mick_AKA · 15 July 2002, 00:44

Quote:

Originally posted by Syko
Way back in the mist's of time, in a publishing house far, far away, there was a magazine for Amiga and Atari ST. They had dual format disks on the cover.

I haven't a clue how they did it, but if you can have Amiga/ST floppy's then why not Amiga/PC?

Cheers

Because Amiga and Atari Disks are both Double Density, all you have to do is put both Amiga and Atari Files on the disk, PC disks however are high density, as far as i know you cant get a half DD and half HD floppy disk!

LUKas007 · 15 July 2002, 01:26

Quote:

Originally posted by Mick_AKA

Because Amiga and Atari Disks are both Double Density, all you have to do is put both Amiga and Atari Files on the disk, PC disks however are high density, as far as i know you cant get a half DD and half HD floppy disk!

Havent you heard of PC 720KB disk format ? It uses the same DD disks as Amiga(880KB) and ST do...

Amiga1992 · 15 July 2002, 04:43

Quote:

Originally posted by Mick_AKA

Because Amiga and Atari Disks are both Double Density, all you have to do is put both Amiga and Atari Files on the disk

That is wrong. Both disks are double density but the formats are COMPLETELY different!

However the PC and Atari disk filesystems are compatible.

Mick_AKA · 15 July 2002, 14:20

well i have jpg images on DD disks that i can read fine with both my a1200 and atari 520stfm!

Amiga1992 · 15 July 2002, 18:00

Of course, because your Amiga is loaded with CrossDOS surely, and CrossDOS reads the disk :P

Mick_AKA · 15 July 2002, 18:46

yes but crossdos reads PC disks, the disk with the jpg's on is an atari st formatted disk, my pc will not read it but my amiga does and I can view the images perfectly with pegger.

Amiga1992 · 15 July 2002, 19:10

Quote:

Originally posted by Mick_AKA
yes but crossdos reads PC disks, the disk with the jpg's on is an atari st formatted disk, my pc will not read it but my amiga does and I can view the images perfectly with pegger.

Sorry, CrossDOS also reads Atari ST disks. I repeat, Amiga and St format have nothing to do with each other.

Mick_AKA · 15 July 2002, 19:15

well then back to the question, how do dual format disks work?
I have dual format copy of carrier command that works with amiga (without crossdos) and atari st!

Oh and crossdos DOES NOT read Atari disks, I just tried it with loads of my Atari ST disks and you just get a Disk Warning box that reads:
Error Validating Disk

Amiga1992 · 16 July 2002, 03:59

Yes it does read Atari disks. Except they are copyprotected I suppose, I dont have further information about the Atari St disk format.

And dual bot disks were made like it was described above. With special machinery or something.

18 June 2004, 11:04

Quote:

Originally Posted by Syko

Way back in the mist's of time, in a publishing house far, far away, there was a magazine for Amiga and Atari ST. They had dual format disks on the cover.

Cheers

I have a mate, who has access to tri format cover disks. They really did get my attention. the idea of a cross platform virus came to mind when I saw that. The tri format disks do look interesting. I never had a go, I just fired up Rick Dangerous and played that instead.

I think "Victory Road" runs on both the Atari and the Amiga. Just yeah runs different versions. I thought their may of been code in the program, that hit some address's to see if it was running on a amiga or a Atari.

Mick_AKA · 18 June 2004, 12:17

I have a copy of lemmings that runs on IBM PC, Atari St and Amiga so I would assume that is a Tri-Format disk, dont know much else about it really!

fiath · 19 June 2004, 13:37

IIRC this is probably Rob Northen's tri-boot block. I think he first did a dual boot (Ami/ST) and (Ami/PC) then all three. Quite clever.

whiteb · 24 July 2004, 14:25

Quote:

Originally Posted by Echostryker

I've formatted a disk as an Amiga 880k disk using Amiga Explorer yet I can still access the PC files on it and the label is still in tact. What's that all about?

Edit: Is is possible to use the extra formatting options with game disks? You know like caching, fast filing system etc or are these just for apps to be used in Workbench?

DD disks were actially 1MB disks but the formatting of the perticular system determined the max size.

Its similar to how CD's work (different tech), You can have a 700MB Recordable CD, but how can you put SVCD's 820MB onto a disk ?
Its all down to the format, SVCD doesnt use error correction areas of the disk.

There are device drivers on Aminet that allowed around 950K on a disk, and sometimes some MFM formats pushed *PAST* 1MB.

[edit] Directory cache and International mode of Fast file system are Amiga only. MSDOS does not support anything like that.

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02 July 2002, 04:29	#21
Amiga1992 Registered User Join Date: May 2001 Location: ? Posts: 19,645	I don't know, it just didn't work here! Strange thing...

15 July 2002, 14:20	#25
Mick_AKA crusader of light Join Date: Jul 2002 Location: Stone, Staffordshire. Posts: 1,151	well i have jpg images on DD disks that i can read fine with both my a1200 and atari 520stfm!

15 July 2002, 18:00	#26
Amiga1992 Registered User Join Date: May 2001 Location: ? Posts: 19,645	Of course, because your Amiga is loaded with CrossDOS surely, and CrossDOS reads the disk :P

15 July 2002, 18:46	#27
Mick_AKA crusader of light Join Date: Jul 2002 Location: Stone, Staffordshire. Posts: 1,151	yes but crossdos reads PC disks, the disk with the jpg's on is an atari st formatted disk, my pc will not read it but my amiga does and I can view the images perfectly with pegger.

15 July 2002, 19:15	#29
Mick_AKA crusader of light Join Date: Jul 2002 Location: Stone, Staffordshire. Posts: 1,151	well then back to the question, how do dual format disks work? I have dual format copy of carrier command that works with amiga (without crossdos) and atari st! Oh and crossdos DOES NOT read Atari disks, I just tried it with loads of my Atari ST disks and you just get a Disk Warning box that reads: Error Validating Disk

16 July 2002, 03:59	#30
Amiga1992 Registered User Join Date: May 2001 Location: ? Posts: 19,645	Yes it does read Atari disks. Except they are copyprotected I suppose, I dont have further information about the Atari St disk format. And dual bot disks were made like it was described above. With special machinery or something.

18 June 2004, 12:17	#32
Mick_AKA crusader of light Join Date: Jul 2002 Location: Stone, Staffordshire. Posts: 1,151	I have a copy of lemmings that runs on IBM PC, Atari St and Amiga so I would assume that is a Tri-Format disk, dont know much else about it really!

19 June 2004, 13:37	#33
fiath Moderator Join Date: Jan 2002 Location: South East / UK Age: 46 Posts: 1,930	IIRC this is probably Rob Northen's tri-boot block. I think he first did a dual boot (Ami/ST) and (Ami/PC) then all three. Quite clever.

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