Looking for VAXSET Software Engineering Tools for VMS 4.x

[Antonio Carlini]

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