Fw: Odd disk image format... .552?

[Paul Berger]

On 2015-12-22 10:08 AM, Nico de Jong wrote:
> On Tue, Dec 22, 2015 at 10:17 PM, Nico de Jong <nico at farumdata.dk> wrote:
>> ---- Original Message -----
>> From: "Mike Ross" <tmfdmike at gmail.com>
>> To: "General Discussion: On-Topic and Off-Topic Posts"
>>> <cctalk at classiccmp.org>
>>> Sent: Tuesday, December 22, 2015 9:41 AM
>>> Subject: Odd disk image format... .552?
>>>
>>>
>>>> Recently found some long-lost images of 5 1/4" floppies that were sent
>>>> to me...  10-15 years ago. Here's one of them:
>>>>
>>>> http://www.corestore.org/RP06.552
>>>>
>>> Seems to be a MSDOS 5.0 boot disk, with just one important program,
>>> RP06.EXE, on it, and then some support programs.
>>> As far as I can see, it is a physical backup. Could the 552 just be a serial
>>> number `?
>> That's kinda what I expected actually... so you reckon they're just in
>> normal raw image format for e.g. Rawrite?
>>
> Suppose so. They took a complete disc, sector by sector, and wrote it as a file.
> /Nico
I would agree that it is just a sector by sector binary dump done with 
something like dd or rawwrite, however it is not a 5.25 diskette the 
format is 80 trks 18 sect 2 heads and media descriptor is 0xF0 which 
would be a 1.44 MB 3.5 diskette.

Paul.