Western Digital scorpio black MX375M, Техническое справочное руководство

Страница: 39 / 59

WD Scorpio MX375M AT Command Set
2679-771293-A01 RELEASED 11/17/10 (WD CONFIDENTIAL) 31
4.2.3 Read Log Sector
There are several logs that can be read with the S.M.A.R.T. Read Log Sector sub-command. The LBA
Low Register indicates the log sector to be returned.
Table 4-6. Defined Error Logging Sectors
4.2.4 Offline Data Collection
The drive supports offline data collection. The multi-zone error rate is an attribute computed from
data gathered during offline activities. Offline data collection is initiated by either the S.M.A.R.T.
Offline Immediate command or the S.M.A.R.T. Enable Automatic Offline command.
There are two internal firmware timers that control automatic offline data collection. The first internal
firmware timer is referred to as the Spin Timer. The Spin Timer accumulates the number of hours the
drive is powered on. Once this timer reaches 8 hours, an offline data collection is said to be “pending.”
The second internal firmware timer is referred to as the Idle Timer. The Idle Timer accumulates the
number of seconds since the drive has received a command from the host. Once the Idle Timer reaches
15 seconds, a “pending” offline data collection process begins. If an in-process automatic offline data
collection process is interrupted by a host command, the automatic offline data collection process will
then resume after 15 minutes of power on followed by 15 seconds of idle time. If the Standby Timer
expires while an offline scan is pending or already in progress, the scan will complete before the drive
spins down.
Log address Content Log Cmds R/W
00h Log directory ExtLog RO
01h Summary Log (up to 5 errors) SMART RO
02h
Comprehensive SMART error log. (5 errors
per sectors)
SMART RO
03h
Extended Comprehensive SMART error log.
(4 errors per sectors)
ExtLog RO
04h-05h Reserved Reserved Reserved
06h SMART self-test log SMART RO
07h Extended SMART self-test log ExtLog RO
08h-0FH Reserved Reserved Reserved
09H Selective self-test log SMART R/W
0Ah-0Fh Reserved Reserved Reserved
11h SATA PHY Counters ExtLog RO
12h-17h Reserved for Serial ATA Reserved Reserved
18h-7Fh Reserved Reserved Reserved
80h-9Fh Host vendor specific SMART / ExtLog R/W
A0h-BFh Device vendor specific SMART / ExtLog VS
C0h-DFh Reserved Reserved Reserved
E0h-E1h SMART Command Transport(SCT) SMART / ExtLog R/W
E2h-FFh Reserved Reserved Reserved
RO – Read Only
R/W – Read / Write
SMART – Supported by B0h command code.
ExtLog – Supported by 2Fh/3Fh command code.
VS – Vendor Specific