Fred Cisin via cctalk:
(...)
> The Seagates were commodity drives, used in almost everything.
> Number is approximately the unformatted capacity.
> ST506 was 5MB formatted (305 Cyl x 2 heads) ;
The ST-506 had 2 platters, 4 heads. Mechanically the ST-506 and the
ST-412 are mostly the same. The
On Tue, Dec 8, 2020 at 3:23 PM Chris Zach via cctalk
wrote:
> Good news: I'm going to get a reader on loan so I should be able to
> image these things. I'll put them up on my web server here, if anyone
> would like to take a look at them let me know.
>
> On a positive note it looks like the Perq
Good news: I'm going to get a reader on loan so I should be able to
image these things. I'll put them up on my web server here, if anyone
would like to take a look at them let me know.
On a positive note it looks like the Perq T2 units used either the ST506
or ST412 drives, so those *might*
On 12/07/2020 03:45 PM, Tom Owad via cctalk wrote:
I have a Bryant platter on the wall of my office, but I’m
not old enough to have seen it operational. 39” diameter,
1/4” thick, made of magnesium. It came out of Collins
Radio Company in Cedar Rapids, IA.
I have a 30" platter from an old
On Mon, 7 Dec 2020, Tom Owad via cctalk wrote:
I have a Bryant platter on the wall of my office, but I’m not old
enough to have seen it operational. 39” diameter, 1/4” thick, made
of magnesium. It came out of Collins Radio Company in Cedar Rapids, IA.
Beautiful pictures
Ok, so like a 2322 Fujitsu SMD drive then? I'll keep eyes peeled.
C
On 12/7/2020 4:27 PM, Al Kossow via cctalk wrote:
On 12/6/20 9:28 PM, Chris Zach via cctalk wrote:
Ok, is there a picture of a Micropolis 8 inch anywhere?
there is a drawing on page 26 of the 1200 series design spec on
> On Dec 7, 2020, at 12:00 PM, Chuck Guzis via cctalk
> wrote:
>
> You really missed out on the big disk drives, say, the old Bryant
> monsters with their 8 pound head assemblies and hydraulic leak bottles.
I have a Bryant platter on the wall of my office, but I’m not old enough to
have seen
On 12/6/20 9:28 PM, Chris Zach via cctalk wrote:
Ok, is there a picture of a Micropolis 8 inch anywhere?
there is a drawing on page 26 of the 1200 series design spec on bitsavers
to the first order, it's a pot metal brick about 8" x 10" x 3" with a logic
board on the top
On Mon, 7 Dec 2020, Chuck Guzis via cctalk wrote:
For a long time, the CDC 808 disk drive was standard fare on CDC 6000--4
spindles spinning stacks of what must have been 30" disks, using an
array of 6-bit parallel heads. About 7 feet tall and very reliable.
Several sources said 26", but one
On Mon, 7 Dec 2020, Chuck Guzis via cctalk wrote:
You really missed out on the big disk drives, say, the old Bryant
monsters with their 8 pound head assemblies and hydraulic leak bottles.
I have a single, slightly damaged RAMAC platter. It is only 24" diameter,
but when I showed it to my
On 12/7/20 10:32 AM, Paul Koning wrote:
>
> I know of the 6603, is that a controller and the 808 is the drive?
The 6603 was the controller for the Bryant drive--I don't know if the
Bryant drive had an 800-series number. But it used zoned recording.
The 808's controller was the 6638. I still
> On Dec 7, 2020, at 12:00 PM, Chuck Guzis via cctalk
> wrote:
>
> On 12/7/20 8:21 AM, Bill Gunshannon via cctalk wrote:
>>
>> Wow. 14"!! last time I saw one of those was on the Apollo that used
>> to warm my house in the winter time.
> ...
> For a long time, the CDC 808 disk drive was
On 12/7/20 8:21 AM, Bill Gunshannon via cctalk wrote:
> On 12/6/20 10:39 PM, Josh Dersch via cctalk wrote:
>>
>>
>> Yeah, the later models used 5.25" media; the rare PERQ 2 used 8"
>> Micropolis
>> drives, and the PERQ 1/1A used 14" Shugart SA-4000 drives.
>>
>
>
> Wow. 14"!! last time I saw
On 12/6/20 10:39 PM, Josh Dersch via cctalk wrote:
Yeah, the later models used 5.25" media; the rare PERQ 2 used 8" Micropolis
drives, and the PERQ 1/1A used 14" Shugart SA-4000 drives.
Wow. 14"!! last time I saw one of those was on the Apollo that used
to warm my house in the winter
Yeah, the later models used 5.25" media; the rare PERQ 2 used 8"
Micropolis drives, and the PERQ 1/1A used 14" Shugart SA-4000 drives.
Ok, is there a picture of a Micropolis 8 inch anywhere? If so I can
watch for it. The other oddball is the Miniframe, that box had no drives
any idea what
On Sun, Dec 6, 2020 at 7:34 PM Chris Zach wrote:
> > I'd suspect that at least a few of these were from PERQ systems, given
> > their provenance. Vertex V150s and Miniscribes were commonly used in
> > the T2 models. As another listmember mentioned, Dave Gesswein's MFM
> > emulator will image
I'd suspect that at least a few of these were from PERQ systems, given
their provenance. Vertex V150s and Miniscribes were commonly used in
the T2 models. As another listmember mentioned, Dave Gesswein's MFM
emulator will image these (and can decode PERQ hard drive formats.)
Probably. I
On Sun, Dec 6, 2020 at 6:25 PM Chris Zach via cctalk
wrote:
> As the excavation of Bob's junkpile continues I have finally hit the MFM
> layer. Specifically about 10 5.25 hard disks that look to be old style
> MFM drives.
>
> Vertex V150
> Miniscribe 6085
> ST 4038M Seagate Franklin telecom
On Sun, Dec 6, 2020 at 7:51 PM Fred Cisin via cctalk
wrote:
> On Sun, 6 Dec 2020, Chris Zach via cctalk wrote:
> > As the excavation of Bob's junkpile continues I have finally hit the MFM
> > layer. Specifically about 10 5.25 hard disks that look to be old style
> MFM
> > drives.
> > Vertex V150
All IBM XT era drives. I have, have had or have given away at least one of
these before. Find a good working ibm xt and a genetic controller with a
manual and a copy of Spinrite software and test 'em. These are all
stiction prone and bad cap vulnerable.
Bill
On Sun, Dec 6, 2020, 9:25 PM Chris
On Sun, 6 Dec 2020, Chris Zach via cctalk wrote:
As the excavation of Bob's junkpile continues I have finally hit the MFM
layer. Specifically about 10 5.25 hard disks that look to be old style MFM
drives.
Vertex V150
Miniscribe 6085
ST 4038M Seagate Franklin telecom AT-40
Miniscribe 3650 HH
As the excavation of Bob's junkpile continues I have finally hit the MFM
layer. Specifically about 10 5.25 hard disks that look to be old style
MFM drives.
Vertex V150
Miniscribe 6085
ST 4038M Seagate Franklin telecom AT-40
Miniscribe 3650 HH
Seagate ST4096
Priam ID45-H
Rodime RO203E
RD54
Real
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