Hitachi 7K400 Specifications - Page 190
Output Parameters From The Device
UPC - 000053412935
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Output Parameters From The Device Feature Current URG (bit7) RC (bit6) NS (bit5) HSE (bit4) Stream ID (bit 0..2) Feature Previous CCTL (7:0) Sector Count Current Sector Count Previous Sector Number Current URG specifies an urgent transfer request. The Urgent bit specifies that the command should be completed in the minimum possible time by the device and shall be completed within the specified Command Completion Time Limit. RC specifies Read Continuous mode enabled. If the Read Continuous bit is set to one, the device shall not stop execution of the command due to errors. If the RC bit is set to one and errors occur in reading or transfer of the data, the device shall continue to transfer the amount of data requested and then provide ending status with BSY bit cleared to zero, the SE bit set to one, the ERR bit cleared to zero, and the type of error, UNC, IDNF or ABRT reported in the error log. If the RC bit is set to one and the CCTL expires, the device shall stop execution of the command and provide ending status with the BSY bit cleared to zero, the SE bit set to one, the ERR bit cleared to zero, and report the fact that the CCTL expired by setting the CCTO bit in the error log to one. In all cases, the device shall attempt to transfer the amount of data requested within the CCTL even if some data transferred is in error. NS (Not Sequential) may be set to one if the next read stream command with the same Stream ID may not be sequential in LBA space. HSE (Handle Stream Error) specifies that this command starts at the LBA of the last reported error for this stream, so the device may attempt to continue its corresponding error recovery sequence where it left off earlier. Stream ID specifies the stream to be read. The device shall operate according to the Stream ID set by the Read Stream command. The time allowed for the current command's completion is calculated as follows: Command Completion Time Limit = (content of the Feature register Previous) * (Identify Device words (99:98)) microseconds If the value is zero, the device shall use the Default CCTL supplied with a previous Configure Stream command for this Stream ID. If the Default CCTL is zero, or no previous Configure Stream command was defined for this Stream ID, the device will ignore the CCTL. The time is measured from the write of the command register to command completion. The number of continuous sectors to be transferred low order, bits (7:0) The number of continuous sectors to be transferred high order, bits (15:8). If zero is specified in the Sector Count register, then 65,536 sectors will be transferred. LBA (7:0). Sector Number Previ- LBA (31:24). ous Cylinder Low Current LBA (15:8). Cylinder Low Previ- LBA (39:32). ous Cylinder High Cur- LBA (23:16). rent Cylinder High Previ- LBA (47:40). ous Input Parameters From The Device Deskstar 7K400 Hard Disk Drive Specification 176