Toshiba MK3006GAL, MK4006GAH 11.7.2 Error Register, 11.7.3 Features Register (Write Precompensation Register), 11.7.2.1 Operational Mode, 11.7.2.2 Diagnostic Mode

11.7.2 Error Register

- CS0

DA2-DA0 : 1

Read ONLY

11.7.2.1 Operational Mode

The following descriptions are bit definitions for the operational mode including the error information from the last command. This command is valid only when the ERROR BIT (bit 0) is set.

ICRC		UNC	MC	IDNF	MCR	ABRT	TK0NF	AMNF

Bit 7	Interface CRC error was found during the transfer of Ultra DMA.
Bit 6	UNC (Uncorrectable Data Error) – This bit indicates that an uncorrectable error has been encountered in the
	data field during a read command.
Bit 5	MC (Media Changed) -- This bit is reserved for use by removable media devices and indicates that new
	media is available to the operating system.
Bit 4	IDNF (ID Not Found) --The requested sector could not be found.
Bit 3	MCR (Media Change Requested) is reserved for use by removable media devices and indicates that a
	request for media removal has been detected by the device.
Bit 2	ABRT (Aborted Command) -- This bit Indicates that the requested command has been aborted due to the
	reason reported in the drive status register (Write Fault, Not Seek Complete, Drive Not Ready, or an invalid
	command). The status registers and the error registers may be decoded to identify the cause.
Bit 1	TK0NF (Track 0 Not Found) -- This bit is set to indicate that the track 000 has not been found during a
	Recalibrate command.
Bit 0	AMNF (AM Not Found) -- This bit is set to indicate that the required Data AM pattern on read operation has
	not been found.

11.7.2.2 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 11.7-1 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.

11.7.3 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.

2ATA-2 Notes: Prior to the development of ATA-2 standard, this bit was defined as BBK (Bad Block Detected) -- This bit was used to indicate that the block mark was detected in the target’s ID field. The mark does not exist when shipping from the factory.The Mark will be written by FORMAT command. Read or Write commands will not be executed in any data fields marked bad. The drive does not support this bit.

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