Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
275
18.51
WRITE (10) - (2A)
Table 256 WRITE (10) - (2A)
Byte
Bit
7
6
5
4
3
2
1
0
0
Command Code = 2Ah
1
WRPROTECT DPO FUA Rsvd=0 FUA_NV Obsolete
2-5
(MSB)
Logical Block Address
(LSB)
6
Reserved = 0
7-8
(MSB)
Transfer Length
(LSB)
9
VU = 0
Reserved = 0
FLAG
LINK
The WRITE (10) command requests that the drive write the data transferred from the Initiator. This command is
processed like the standard WRITE (6) - (0A) command except for the longer transfer length.
- Transfer Length is the number of contiguous blocks to be transferred. If the transfer length is zero, the seek
occurs, but no data is transferred. This condition is not considered an error.
- DPO (Disable Page Out) bit of one indicates that the data accessed by this command is to be assigned the
lowest priority for being written into or retained by the cache. A DPO bit of one overrides any retention priority
specified in the Mode Select Page 8 Caching Parameters. A DPO bit of zero indicates that the priority is
determined by the retention priority. The Initiator should set the DPO bit when the blocks written by this
command are not likely to be read in the near future.
- FUA (Force Unit Access) bit of one indicates that the Target must write the data to the media before returning
Good status. A FUA bit of zero indicates that the Target may return Good status prior to writing the data to the
media.
- FUA_NV (Force Unit Access Non-Volatile Cache) may be set to 0 or 1, but is ignored since NV_SUP=0 in
Inquiry Page 86h.
If a WRITE(6) command is received after protection information is enabled, the drive will set the protection
information as follows as it writes each block to disk:
- the Logical Block Guard field is set to a properly generated CRC
- the Logical Block Reference Tag field is set to:
- the least significant four bytes of the LBA, if the drive is formatted with type 1 protection (PROT_EN=1 and
P_TYPE=000b in the READ CAPACITY (16) parameter data); or
- FFFFFFFFh, if the drive is formatted with type 2 protection (PROT_EN=1 and P_TYPE=001b in the READ
CAPACITY (16) parameter data)
- the Logical Block Application Tag field is set to
- FFFFh, if the ATO bit is set to one in Mode Page 0Ah; or
- Any value, if the ATO bit is set to zero