Looking for a ST419
ethan.dicks at usap.gov
Fri Oct 31 17:05:57 CDT 2008
On Fri, Oct 31, 2008 at 09:16:47PM +0000, Tony Duell wrote:
> > > ISTR the bitrate from a ST412 drive was about 5 MHz...
> The obvious thing to do is to sample the data stream (either from the
> controller wehn writing/formatting, or from a good drive if you want to
> copy it) at about 10 times the data rate (that's where the 'high speed'
> requirement comes from) and record it in flash memory or something. Then
> replay it back to the cotnroller for reading. It's doable, but getting it
> all working at 50MHz is not going to be trivial.
I agree that a 50MHz digitizer is not a trivial device, but if it would
still work backed down to 25MHz or even a little slower, say 4x or 5x
the rate of the raw stream, there'd be a lot more margin to work with,
especially with modern high-speed microcontrollers like the Dallas
You still need a local storage system fast enough to handle the bits once
they are collected and possibly partially analyzed/reduced. That's one
arena in which a rotating disk is simpler than many solid-state solutions.
Ethan Dicks, A-333-S Current South Pole Weather at 31-Oct-2008 at 22:00 Z
South Pole Station
PSC 468 Box 400 Temp -53.9 F (-47.7 C) Windchill -79.6 F (-62.0 C)
APO AP 96598 Wind 6.9 kts Grid 9 Barometer 676.5 mb (10761 ft)
Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html
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