Quantum DLT 4000 Product Manual page 278

DLT4000 SCSI Interface
Pattern
0
1
2
3
4
5
6
7
8
9
If the Max Number of Passes is zero, this indicates to loop forever. A BUS Reset or a
selection from the host sending an Abort or a Bus Device Reset message will
terminate testing.
If the Block Size field is set to zero, random block sizes will be used.
The Block Count field specifies how many blocks to write/read starting first on track
0, then again on track 1. So if the Block Size and Count fields result in 3 tracks worth
of data, the test will:
Write tracks 0, 1, 2
Rewind, read, and verify 0, 1, 2
Write 3 tracks starting with 1: 1, 2, 3 and then rewind to the beginning of track 1
and do the read/verify pass. If Block Count is set to zero, data will be written until
EOT is reached each time, so almost 4 complete passes over the tape would result.
_________________________ NOTE ____________________________
Because of data generation and verification, this test only streams the tape
for short periods of time. Therefore, if Block Count is set very high, this
test can take many minutes or even many hours to complete.
___________________________________________________________
If the specified test passes, a GOOD STATUS is returned. Otherwise, a Check
Condition is generated, and the Sense Data will contain information about the failure.
8-118 DLT4000/DLT4500/DLT4700 Cartridge Tape Subsystem
Table 8-9 Definition of Pattern Numbers
Name
Rotate
All 0's
2F
Alternating 1's and 0's
Marching 1
Marching 0
MW
MFM
1F
Random Data
Data in Hex
(Rotate through the other 9 patterns,
change for each tape file)
00 00 00 00 00
FF FF FF FF FF
55 5A AA A5 55 5A AA A5
01 02 04 08 10 20 40 80
FE FD FB F7 EF DF BF 7F
0E 0E 0E 0E 0E 0E 0E 0E
DE AD DE AD DE AD DE AD
AA AA AA AA AA AA AA AA