Maxtor 10K III manual Write Long Command Descriptor Block-Data Format, 220

SCSI Description

￿￿￿￿94+6'The ￿WRITE.10)￿%QOOCPFLONG and READ￿￿￿(J￿LONG commands allow the initiator to issue raw reads and writes of physical sectors addressed as logical blocks with an assumed sector length of 512 bytes. These commands are used to verify the correction capability of the drive's ECC and to create defects of a known kind and location to verify the drive's recovery and bad sector handling policies. The data format and field descriptions are shown in Table 5-220and Table 5-221respectively.

WRITE LONG Command Descriptor Block-Data Format

0	Operation Code (3Fh)
1		Reserved	RelAdr
2 - 5	Logical Block Address
		Reserved
7 - 8	Byte Transfer Length (562)
		Control

$[VG$KV	￿	￿WRITE￿LONG Command￿		-Field￿Descriptions￿	￿	￿
RelAdr(KGNF		beRelative0.	Address. This drive does&GUETKRVKQPnot support this feature; the field must
Logical Block		The address of the first logical sector where the Write operation will occur.
Address
Table5-220		Must be 562. This value reflects the number of bytes spanned by the ECC,
		including the ECC itself, rounded up to the next word (this is easiest un-
		derstood in bits: 4096 data bits + 1 force error bit + 15 Logical Block Ad-
		dress bits + 16 cross check bits + 2 pad bits + 360 ECC bits + 6 pad
Byte Transfer		bits that are not written to media but are only needed for transfer = 4496
		bits or 562 bytes). Any other value in this field results in a CHECK CON-
Length
		DITION status and the appropriate sense data.
Table
		The initiator should first issue a READ LONG, then modify the data portion
		only, and then issue a WRITE LONG. It is also recommended that the drive
		5be-221reformatted after these commands are used.

Maxtor Atlas 10K III 5-175