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10.7.5 Sector Number Register
- CS0
The target logical sector number (starting from 1) for Read, Write, and Verify commands is set in this register. After completion of a command, it shows the sector number of the last sector transferred to the host.
The starting sector number is set in this register for
In LBA mode, this register contains Bits 0 - 7 logical block address. After completion of a command, the register is updated to reflect the current LBA Bits.
10.7.6 Cylinder Low Registers
- CS0
Read / Write
10.7.6.1 Disk Access command
Lower 8 bits of the starting cylinder number(starting from 0) for Read, Write, Seek, and Verify commands are contained in these registers. After completion of the command or sector transfer, the current cylinder is shown in this register.
In LBA mode, Bits 8 - 15 of the target address in logical block address are set in this register. After completion of a command, the register is updated to reflect the current LBA Bits 0 - 7.
10.7.6.2 SMART commands
This register should be set to 4Fh for SMART commands
10.7.7 Cylinder High Registers
- CS0
Read / Write
10.7.7.1 Disk Access command
The high order 2 bits of the starting cylinder number (starting from 0) for Read, Write, Seek, and Verify commands are set in this register. Together with Cylinder Low Register, it defines 0 to 1,023 cylinders. After completion of the command or sector transfer, this register shows the current cylinder.
In LBA mode, Bits 16 - 23 of the target address in logical block address are contained in this register. After completion of the command, it shows the Bits 0 - 7 of the last logical block address.
| Cylinder High |
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| Cylinder Low | |||
Register Bits | 7 |
| 6 | 5 | 4 | 3 | 7 6 5 4 3 2 1 0 |
| 2 | 1 | 0 |
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Cylinder Bits | 15 | 14 13 12 11 10 | 9 | 7 6 5 4 3 2 1 0 | |||
| 8 |
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