Hitachi 7K320 Specifications - Page 103

7K320 (SATA) OEM Specification 14.12 Initialize Device Parameters (91h) Command Block Output Registers Register 76543210 Data -------- Feature -------- Sector Count VVVVVVVV LBA Low -------- LBA Mid -------- LBA High -------- Device - - - - HHHH Command 10010001 Command Block Input Registers Register 76543210 Data -------- Error ...See Below... Sector Count -------- LBA Low -------- LBA Mid -------- LBA High -------- Device -------- Status ...See Below... Error Register 7 6 5 4 3 2 1 0 CRC UNC 0 IDN 0 ABT T0N AM N 000 0 0V0 0 Table 68 Initialize Device Parameters Command (91h) Status Register 7 6 5 4 3 2 1 0 BSY RDY DF DSC DRQ COR IDX ERR 0 0 0 - - 0 0V The Initialize Device Parameters command enables the host to set the number of sectors per track and the number of heads minus 1, per cylinder. Words 54-58 in Identify Device Information reflects these parameters. The parameters remain in effect until the following events:  Another Initialize Device Parameters command is received.  The device is powered off.  Soft reset occurs and the Set Feature option of CCh is set Output Parameters To The Device Sector Count The number of sectors per track. 0 does not mean there are 256 sectors per track, but there is no sector per track. H The number of heads minus 1 per cylinder. The minimum is 0 and the maximum is 15. Page 103 of 176