archiving data, was RE: Media Longitevity/Care
ethan.dicks at gmail.com
Sun Mar 20 11:51:13 CST 2005
On Sun, 20 Mar 2005 09:47:36 +0000, jpero at sympatico.ca
<jpero at sympatico.ca> wrote:
> Try to make adapter to convert from one interface to IDE interface
> and use CF card. Smallest is 8MB all the way to 8GB and price is
> good on 1GB and below. If one knows well with SD stuff, great!
Flash isn't a perfect replacement for rotating magnetic media for any
OS that has a swap partition... heavy use will begin to deplete
regions of the Flash media. Before anyone says that it will take "X
million years..." I want to comment that I've seen it happen myself in
heavy use situations... specifically, I rigged up an old Olympus
camera as a webcam for my "EarthDial". I used this camera because it
was the end of summer at the South Pole and there wasn't time to get
get something more suitable before our 8 month winter started. The
camera was controllable via RS-232 serial line and gphoto. The one
weakness was its 8MB SmartMedia storage. I took several thousand
pictures, one every 5 minutes for several weeks. As the weeks wore
on, the capacity of the card diminished by about 5%.
Also... I happen to have a small stack of 4MB CF cards. I've never
seen any with lower capacity than that (in full-sized PCMCIA
form-factor, I happen to have 2.5MB cards, and ISTR there were 1MB
The low end doesn't matter for a theoretical RL02 replacement... those are 10MB.
In the case of the DF32, we've looked at battery-backed SRAM, not CF.
The one end-to-end (not platter-only) replacement project uses a
40-pin potted SRAM/battery combo like the clock/SRAMs in a
SPARCstation, but much larger. With RAM sizes, etc, it's not absurd
to consider SRAM for an RK05 or RL01, but by the time you get to RL02
sizes, board size and component expenses start to climb.
> Platters are very hard high quality aluminum alloys...
Nice description of modern platters... I knew some of that stuff, but
not the details. Certainly relevant to the issue of someday folks
like us having to manufacture replacements. Unfortunately, not as
relevant to the more immediate requirement to make or re-make DF32
platters, which are not like aluminum/glass platters.
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