IBM DBCA-204860 Hard Drive Specifications - Page 108
Execute Device Diagnostic
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12.2 Execute Device Diagnostic (90h) Command Block Output Registers Register 76543210 Data Feature Sector Count Sector Number Cylinder Low Cylinder High Device/Head 11 Command 10010000 Command Block Input Registers Register 76543210 Data Error ...See Below... Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status ...See Below... Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 0VVVVVVV Status Register 76543210 BSY RDY DF DSC DRQ COR IDX ERR 000 0 0 Figure 60. Execute Device Diagnostic Command (90h) The Execute Device Diagnostic command performs the internal diagnostic tests implemented by the device. The results of the test are stored in the Error Register. The normal Error Register bit definitions do not apply to this command. Instead, the register contains a diagnostic code. See Figure 47 on page 67 for the definition. 100 OEM Specifications of DBCA-2xxxxx 2.5 inch H D D