troubles with an Exhabyte tape drive

[Mikhail Teterin]

Hello!

We can read the tapes using this drive:

sym0: <875> port 0x2400-0x24ff mem 0x42000000-0x42000fff,0x42100000-0x421000ff 
irq 11 at device 16.0 on pci0
sym0: Symbios NVRAM, ID 7, Fast-20, SE, parity checking
sym0: open drain IRQ line driver, using on-chip SRAM
sym0: using LOAD/STORE-based firmware.
sa0 at sym0 bus 0 target 0 lun 0
sa0: <EXABYTE EXB-89008E030203 V41e> Removable Sequential Access SCSI-2 device 
sa0: 20.000MB/s transfers (10.000MHz, offset 15, 16bit)


but we can not write anything :-( The kernel's messages logged are:

	(sa0:sym0:0:0:0): WRITE(06). CDB: a 0 0 28 0 0 
	(sa0:sym0:0:0:0): ILLEGAL REQUEST asc:30,5
	(sa0:sym0:0:0:0): Cannot write medium - incompatible format

Is it our clumsiness, or the tapes (we tried about a dozen), or the
drive? Thanks a lot!

	-mi