Pomoc se zalohovanim

[Břetislav Kubesa]

Prosim o pomoc se zalohovanim na pasku, netusim v cem je problem.
Pouzivam toto zarizeni (HP 72i USB) :
sa0 at umass-sim0 bus 0 target 0 lun 0
sa0: <HP C7438A ZU5A> Removable Sequential Access SCSI-3 device
sa0: Serial Number HU10708XVL
sa0: 40.000MB/s transfers

A tento skript pro zalohovani  - 
http://www.freebsddiary.org/samples/dump.sh.txt . Samozrejme s upravami - 
TARGET=/dev/nsa0
...zaloha probehne v poradku, problem je s restorem ...
mt rewind
mt -f /dev/nsa0 fsf 1
 restore if /dev/sa0 ---> OK
mt -f /dev/nsa0 fsf 2
 restore if /dev/sa0 ----> OK
mt -f /dev/nsa0 fsf 3
 restore if /dev/sa0 ----> tape read error: Unknown error: 0 ????

mt status :
Mode      Density              Blocksize      bpi      Compression
Current:  0x47                 variable       0        DCLZ
---------available modes---------
0:        0x47                 variable       0        DCLZ
1:        0x47                 variable       0        DCLZ
2:        0x47                 variable       0        DCLZ
3:        0x47                 variable       0        DCLZ
---------------------------------


Dokazete mi prosim rici, co delam spatne ?
Take napr. kdyz se snazim vymazat pasku pres mt erase, po cca 45-50 min 
skonci opet s chybou...

Diky.

BK