Dear sirs,

I have some 4mm dat cartridges (4GB) made in a HP-UX 11.00 with a standard tar command (tar -cv files_to_backup) made with a scsi dat drive HP 35470A.

After more than one year I need to restore some data on a linux system (Red Hat 7.2) which has the same dat drive.

Now I tried to list the content of the cartridges but without any result.
In particular I used the following command:

$tar -tvf /dev/st0

After this command the lights on the tape driver blink and the tape run. But after 3-4 seconds everything stop and the prompt $ apper after the above command whithout any other message.
I tried also to use the following command

$tr -tvbf n /dev/st0

replacing n with different numbers (1-10-20-512)
but with the same result.
I tried all the above also as "su" and with other similar cartidges.

After the first blink and run of the tape driver if I repeat the command I get istantly the prompt symbol $ without any activity on the tape. To have a new activity (blink for some seconds) I have to extract and re-insert the tape.

Please, what I can do to list (and extract) my files from the catridges? What else can I try?
Thanks