On 17/04/2021 19:35, Al Kossow via cctalk wrote:
On 4/17/21 11:30 AM, Antonio Carlini via cctalk
wrote:
So far I've just tried using dd to recover
the data but perhaps I
should try to find something that won't give up when the OS reports
an unreadable sector. Anyone have any suggestions?
ddrescue
I guess I should've remembered that one, thanks!
So has this just lost ~3KiB? "pct rescued" suggests that it did quite
well. Does "bad areas" mean one bad sector (2048 bytes)?
$ ddrescue -r5 -v /dev/sr1 JUL89DIST.iso JUL89DIST.map
GNU ddrescue 1.23
About to copy 623247 kBytes from '/dev/sr1' to 'JUL89DIST.iso'
??? Starting positions: infile = 0 B,? outfile = 0 B
??? Copy block size: 128 sectors?????? Initial skip size: 128 sectors
Sector size: 512 Bytes
Press Ctrl-C to interrupt
???? ipos:? 623246 kB, non-trimmed:??????? 0 B, current rate:?????? 0 B/s
???? opos:? 623246 kB, non-scraped:??????? 0 B, average rate:?? 1303 kB/s
non-tried:??????? 0 B,? bad-sector:???? 4096 B, error rate:????? 73 B/s
? rescued:? 623243 kB,?? bad areas:??????? 1, run time:????? 7m 58s
pct rescued:?? 99.99%, read errors:?????? 49, remaining time:???????? n/a
????????????????????????????? time since last successful read:????? 5m 11s
Finished
This is what ls sees (I renamed the ISO to match what it actually is):
-rw-rw-r-- 1 antonioc antonioc 623243264 Apr 17 20:14
CDROM-AG-MN36E-RE-1989-07-VMS-CONDIST.iso
(That happens to be exactly the same result as dd).
Antonio
--
Antonio Carlini
antonio at
acarlini.com