Quantum Instruments DLT 7000 Send Diagnostic Parameter List Field Descriptions, Ff Ff Ff Ff Ff

SCSI Commands

SEND DIAGNOSTIC Command (1Dh) (continued)

Table 5–77 SEND DIAGNOSTIC Parameter List - Field Descriptions

Field Name	Description
Pattern Number	Indicates the type of data pattern to be used during the diagnostic tests.
	Pattern	Name	Data in Hex
	0	Rotate	Rotate through the other 9 patterns;
			change for each tape file.
	1	All 0s	00 00 00 00 00
	2	2F	FF FF FF FF FF
	3	Alternating 1s and 0s 55 5A AA A5 55 5A AA A5
	4	Marching 1	01 02 03 04 08 10 20 40 80
	5	Marching 0	FE FD FB F7 EF DF BF 7F
	6	MW	0E 0E 0E 0E 0E 0E 0E 0E
	7	MFM	DE AD DE AD DE AD DE AD
	8	IF	AA AA AA AA AA AA AA AA
	9 (default)	Random Data
Maximum Number	This field specifies the number of test passes of the diagnostic to be run. If
of Test Passes	Maximum Number of Test Passes = 0, the test will loop continuously. A
	BUS RESET or a selection from the host sending an ABORT or BUS DEVICE
	RESET message terminates testing. Default = 1
Block Size	This field specifies the size of the blocks to be used. If this field is 0, random
	block sizes are used. Default = 8400 bytes (DLTtape III media); 64 K
	(DLTtape IV media).
Block Count	This field specifies how many blocks to WRITE / READ to and from starting
	on track 0, then moving to track 1. Default = 500.

For example, if the Block Size and Block Count fields result in three (3) tracks worth of data, the test will:

Write tracks 0, 1, 2

REWIND, READ, and VERIFY tracks 0, 1, 2

WRITE three tracks starting with 1: 1, 2, 3 and then REWIND to the beginning of track 1 and perform the READ and VERIFY pass.

If Block Count is = 0, data is written until EOT is reached each time, so almost four (4) complete passes over the tape would result.

Quantum DLT 7000 Tape System 5-161