archiving data, was RE: Media Longitevity/Care
Gordon JC Pearce
gordon at gjcp.net
Sun Mar 20 01:54:06 CST 2005
Ethan Dicks wrote:
> Having said that, someday I know I'll have to face at least one round
> of this... I have several DF32 drives that I expect have seriously
> worn plating (I've only ever tested the electronics, but I _have_ spun
> the platters up and down, 20 years ago, long before I knew it could
> cause a problem). Getting a replacement platter fashioned and turned
What about RL02s? Are they meant to be left alone once mounted and run
up, or can you treat them like big Zip disks?
> to suitable smoothness is completely within the realm of accessible
> tools for steam engines, etc. It's really no worse than turning a
> brake rotor. My only real concern is _plating_ the platter. Setting
Turning brake discs is something I've never understood. They're cheap.
They're your *brakes*. If the disc is scored or corroded, *throw the
pair away*. For the amount of hassle that's involved, it's just not
worth doing it twice. </offtopic>
> up an electroplating rig is easy enough (I copper plated a number of
> nickels and quarters as a lad ;-) presuming one can a) come up with an
> acceptable formula for the coating, and b) gain access to the various
I thought the coating was sprayed on? Looking at the edge of an RL02,
there are clear "dribble marks" where it's run down the side of the disk.
> soluable compounds to mix up a batch of plating solution. Even when
> that's done, one still has to construct the timing track generator,
> but at least that's well documented, so one could build the real deal
> from old DEC bits, or one could simulate a formatter with modern
> circuitry... the timing pulses are not that bad.
I did wonder about such a thing. I'm still trying to get my head round
the DF32 timing for my PDP8 emulator.
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