ruck@sphere.UUCP (John R Ruckstuhl Jr) (06/15/90)
I have opened my 3b1 a few times during the past ~18 months to clean the hard disk's antistatic tab (to stop hard disk whine). At the time this operation was discussed (~18 months ago?), some posters commented that the tab was unnecessary, and that it could simply be removed without harm. Has anyone removed their disk's antistatic tab? Any side-effects? [BTW, thanks to you who originally explained this fix... I had already had the original drive *replaced* (under warrenty) because of this whine, then the replacement drive began whining, and I was getting very agitated.] Also: My 3b1 ingests much dust. How do you/I remove the accumulated dust from the opened 3b1? (I considered wiping the motherboard with an old paintbrush, but worried about static (dis)charge.) How would I checksum a diskette so that I could verify the integrity of copies? How about: $ dd if=/dev/rfp021 | sum and perhaps better, $ dd if=/dev/rfp021 ibs=4k obs=4k | sum -r Does anyone checksum backups? Or is checksum inherent in cpio, so if one can cpio -iBct (or cpio -iBc ?), then the backup is clean? Thank you for any information. Regards, John. -- John R Ruckstuhl, Jr UUCP: sphere!ruck DOMAIN: ruck%sphere@hp-lsd.cos.hp.com
yarvin-norman@CS.YALE.EDU (Norman Yarvin) (06/16/90)
In article <303@sphere.UUCP> ruck@sphere.UUCP (John R Ruckstuhl Jr) writes: >My 3b1 ingests much dust. How do you/I remove the accumulated dust from >the opened 3b1? (I considered wiping the motherboard with an old >paintbrush, but worried about static (dis)charge.) I have used compressed gas. Traditional products use CFCs, and I have also seen plain compressed air for this purpose. The last time, I just used lung power. Has anybody tried a fire extinguisher? (the CO2 kind, not the water kind :-)) Presumably an air compressor would also work? Bottled gas for cleaning my computer is not the kind of thing I like spending money on. >Does anyone checksum backups? Or is checksum inherent in cpio, so if >one can cpio -iBct (or cpio -iBc ?), then the backup is clean? I think either the kernel or the hardware writes CRCs for each disk block. I know the standard backup routine just does a cpio -iBct (or whatever) if you ask it to "verify the backup". (You want the 't' option, or else you'll be restoring.) -- Norman Yarvin yarvin-norman@cs.yale.edu "Obviously crime pays, or there'd be no crime." -- G. Gordon Liddy