Sony DDS-4, Руководство по описанию продукции

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SONY SDT-10000/SDT-11000 DDS Tape Drive 7 - 9
7. DIAGNOSTICS
7. 1. 7 Diagnostic Tests requiring additional parameters
The diagnostic tests which require additional information in the Parameter A, B & C bytes are:
02 Error Rate Test
43 Read Data Exerciser
7. 1. 7. 1 Error Rate Test (02) Diagnostic Parameters
This test reads or writes the number of groups defined by the Group Count. Any RAW retries, C3 ECC retries and Read/
Write hard errors encountered during the test are reported in the Error Rate Log which may then be examined to determine
tape performance.
Bit 7 6 5 4 3 2 1 0
Byte
0 Diagnostic Test Number (02h)
1 Loopcount
2 Test Pattern BOT RND WRT RD NLR
3 (MSB) Group Count
4 (LSB)
Table 7-5: Error Rate Test Data
The Test Pattern and RND fields are only relevant if the test includes a write pass, otherwise their values are ignored.
Test Pattern: 0 - all zeros
1 - All ones
2 - Alternating ones and zeros
3 - Rotating data bytes (0,1,2,...,255)
4 - Pseudo-random data
5 - Worst case (C6h) bytes