24 May
2002
24 May
'02
6:32 p.m.
Whoa, I have never heard of 5.25" SMD disks before... I wish I had some!
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25 May
25 May
6:17 a.m.
On 24 May, Will Jennings wrote:
Whoa, I have never heard of 5.25" SMD disks
before...
I wish I had some!
I am very glad to have two of them. They are not that common,
but there
where some made by a few manufacturers. Unfortunately the 1GB Seagate is
useless due to lack of documentation. That beast is fast. 5,400 RPM,
33,600 bytes per track is nearly 3MB/s raw data rate.
I have a 360MB Hitachi 5.25" SMD disk that works well in my Sun 3/260 on
the Xylogics...
--
tschuess,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz
28 May
28 May
1:24 p.m.
--- Will Jennings <xds_sigma7(a)hotmail.com> wrote:
Whoa, I have never heard of 5.25" SMD disks
before... I wish I had some!
I remember a while ago, when such would have been a deal, some surplus
vendor had 600MB 5.25" SMD drives for $595. He *clearly* stated
that these were *not* MFM/ST506 drives and would *not* work in an
ordinary PC. ISTR, 600MB was around $800-$1000 at the time, for ESDI
and/or SCSI.
I also recall that there's something about the data rate that makes
these potentially incompatible with older interfaces, like the kind
you find on a Qbus or Unibus.
All I've ever owned are largish SMD devices (Fujitsu, mostly), in the
10"-14" realm, so YMMV.
-ethan
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4:17 p.m.
On 2002.05.28 20:24 Ethan Dicks wrote:
I also recall that there's something about the
data rate that makes
these potentially incompatible with older interfaces, like the kind
you find on a Qbus or Unibus.
Yes. There is SMD, SMD-0 and SMD-E, and different
data rates. I don't
know the exact differences in SMD variations, but fortunately the QD33
supports the later variants:
QD33 Q Emulex SMD controller for up to two SMD disks.
Supports SMD-0 and SMD-E, with data rates up to
24MHz for SMD-E. MSCP emulation. DMA
AFAIK my 9" 1GB NEC disks are SMD-E at 24MHz and they work well on the
QD33.
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
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