SCSI TK50 and writing tape
Mr Ian Primus
ian_primus at yahoo.com
Sun Aug 12 06:00:59 CDT 2007
My attempts to boot the MicroVax continue:
After much digging around at the house, I finally
found another TK50 cartridge. This one is in good
condition. I cleaned my SCSI TK50 drive, and mounted
the tape. It read fine, I was able to dd the contents
(one ~70mb VMS data file, with header and trailer) off
the tape and onto my PC. So far so good. I erased the
tape, and tried to write the NetBSD boot.fs to it.
dd if=boot.fs of=/dev/nst0 bs=512
And the drive whirred to life, shoeshining tape back
and forth,but actually making progress through the
media (it was accumulating on the take-up reel,
anyway). So I let it run. Eventually it failed with an
I/O error at a point where most of the tape was out of
the cartridge. It took over an hour to get there, and
only made it through one length of tape (no track
change/reverse) Rewind, erase tape again.
So, I tried just plain 'dd if=boot.fs of=/dev/nst0'
without specifying the block size (although from what
I've read, NetBSD wants a block size of 512 to boot)
That shoeshined like crazy too, so I stopped it.
Try again, with a block size of 16k (the same block
size I used to read in the tape). Still no go, it
still shoeshines, but not quite as much (barely).
What do I need to do here? How long should it take to
write two and a half megabytes of data to tape?
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