Hitachi HDT725025VLA380 Specifications - Page 121
Key Sector Format
UPC - 829686001084
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Command Block Input Registers (Success) Command Block Input Registers (Error) Register 7 6 5 4 3 2 1 0 Register 76543210 Error 00h Error 04h Sector Count HOB=0 Depends on command Sector (LSB) Count HOB=0 Extended Status Code (LSB) HOB=1 Reserved HOB=1 Reserved LBA Low HOB=0 Depends on command LBA Low (MSB) HOB=0 Extended Status Code (MSB) HOB=1 Reserved HOB=1 Reserved LBA Mid HOB=0 Number of sectors (LSB) LBA Mid HOB=0 Number of sectors (LSB) HOB=1 Reserved HOB=1 Reserved LBA High HOB=0 Number of sectors (MSB) LBA High HOB=0 Number of sectors (MSB) HOB=1 Reserved HOB=1 Reserved Device/Head Device/Head -------- Status 50h Status 51h 10.18.1.3 Key Sector Format An SCT command (Key Sector) is always 512 bytes long. Table below shows the generic format of an SCT command. Byte 1:0 Field Action Code Words 1 3:2 Function Code 1 X:4 Y:x+1 ... Parameter1 Parameter2 ... Total Words Depends on command Depends on command ... 256 Description This field defines the command type and generally specifies the type of data being accessed, such as sector, long sector, etc. or physical action being performed, such as seek. This field specifies the type of access, and varies by command. For example, this can specify read, write, verify, etc. Depends on command Depends on command ... The action codes are defined in Table below. Deskstar T7K500 Hard Disk Drive Specification 107