Please read MichaelFay's response
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\<scsi driver name>\Parameters\Device\MaximumSGList
set MaximumSGList =(OBBlockSize in kB / 4) +1 - so for 256k it is (256/4)+1=65
If your Block Size is set to something other than 64KB, you will get this error
The other possibility is that your Drive Index is incorrect for your tape drive, but, I haven't seen that on ein years