[Info-vax] Odd BACKUP error: unsupported file structure !

[hb]

On Nov 21, 11:13 pm, JF Mezei <jfmezei.spam... at vaxination.ca> wrote:

> I tried to copy the allin1 software which was on that drive to the
> healthy system disk. Allin1 crashed or said that a premature end of file
> was encountered (although ana/image discovered 0 errors). So I am in the
> process of installing it from scratch and will move config files from
> older backups (those don't change much) once it is installed. A pain to
> do since my remaining use of A1 is to port data/documents to another
> platform.
>
> So it looks like data corruption had truly begun on the drive.

Maybe. But if Allin1 crashed, then the image would have been activated
without any problem. If the image file were corrupt, the image
activator would have reported a problem. Ana/image is very likely
correct, but on the other hand, ana/image is not the tool to check the
correctness of an image file: it is a tool to format the image data.
Any error it encounters while formatting the data it will report, any
other error is undetected.

> last resort would be to run the VAX version on SIMH or fire up my
> remaining VAXstation 3100 to extract the data. (I have good backups of
> that data).

I would have connected the disk to a PC with Linux and would have made
a disk image with dd_rescue. Then I would have read the disk image
with vdisk, LD or the Linux ods5 file system.