10.7.2.2 Diagnostic Mode

The drive enters diagnostic mode immediately after the power -on or after an Execute Diagnostics command. Error bit in Status Register shall not be set in these cases. The following table shows bit values for the diagnostic mode.

Table 10.7-1 Diagnostic mode error register

01

No errors

02

Controller register error

03

Buffer RAM error

04

ECC device error

05

CPU ROM/RAM error

06-7F

Reserved

8x

Drive1 error (see below)

When two drives are daisy-chained on the interface, the Drive0 has valid error information for diagnostic mode. When the Drive1 detects an error, 80H and OR value (01～04) diagnosed by the Drive0 are set to the code above mentioned.

10.7.3 Features Register (Write Precompensation Register)

- CS0

DA2-DA0 : 1

Write only

Write precompensation is automatically optimized by the drive internally. This register is used with Set Features command.

10.7.3.1 Smart command

This command is used with the Smart commands to select subcommands.

10.7.4 Sector Count Register

- CS0

DA2-DA0 : 2

Read / Write

10.7.4.1 Disk Access command

The sector count register determines the number of sectors to be read or written for Read, Write, and Verify commands. A 0 in the sector count register specifies a 256 sector transfer. After normal completion of a command, the content shall be 0.

During a multi-sector operation, the sector count is decremented and the sector number is incremented. If an error should occur during multi-sector operation, this command shows the number of remaining sectors in order to avoid duplicated transfer.

10.7.4.2 Initialize Device Parameters command

This register determines number of sectors per track.

10.7.4.3 Power Control command

This register returns a value in accordance with the operation mode (idle mode or stand-by mode).

10.7.4.4 Set Features Command

If features register for this command is 03h, this register sets the data transfer mode.

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