HP 7957A Hardware Manual page 67

Service Information
7957A/7958A
Table 4-1. Supported Utilities
CS/80 NO EXECUTION MESSAGE (no information is returned to host)
Clear Logs
Preset
CS/80 SEND EXECUTION MESSAGE (drive returns information to host)
Read Fault Log
Read Run Time Error Log
Read Error (ERT) Log
Measure Seek Time
Read Spare Table
Locate and Read Full Sector
Servo Test
Pattern Error Rate Test (ERT)*
Random Pattern Error Rate Test (ERT)*
Read Only Error Rate Test (ERT)*
Random Read Only Error Rate Test (ERT)*
Read ROM Revision Number
*These utilities provide both a NO EXECUTION MESSAGE and a SEND
EXECUTION MESSAGE depending upon the bits set in the "Initiate Utility"
command. Refer to paragraph 4-30.
4-13