Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
163
19.7.14 Log Sense Page 37This page contains a series of miscellaneous data counters including information about predictive failure analysis occurrences.
Table 137:Log Sense Page 37
The Power on Hours field specifies the total time the drive has been powered on in hours only.
The Max. Drive Temperature field specifies the maximum temperature, in degrees Celsius, the drive has ever reached.
The Glist Size field gives the total number of LBAs that have been reassigned on the drive.
The Number of PFA Occurrences field gives the number of PFA occurrences during the life of the drive and not the number
of PFA events that have been reported. The number of reported PFA events may be less due to the settings of Mode Page
0x1C.
If set, the Media and Hardware PFA bits indicate that a PFA trip has occurred during the life of the drive. These flags are set
during a PFA occurrence that may or may not coincide with the reporting of a PFA event as mentioned above.
Total Read Commands counter is incremented for each Read (6) and Read (10) command received.
Total Write Commands counter is incremented for each Write (6), Write (10), Write Verify and Write Verify (16) command
received.
Flash Correction Count is incremented each time ECC correction is applied to data stored in Flash ROM.
Byte Bit
76543210
0 Reserved Page code = 37h
1 Reserved
2-3 Page Length = 0030h (48)
4-5 Parameter Code = 0000h
6 DU=0 DS=0 TSD=0 ETC=0 TMC = 0 F&L = 00b
7 Parameter Length = 2Ch
8
-
11
(MSB)
Power on Hours (hours only)
(LSB)
12
-
19
(MSB)
Tota l By tes Rea d
(LSB)
20
-
27
(MSB)
Total Bytes Written
(LSB)
28 Max Drive Temp (degrees Celsius)
29 - 30 (MSB) GList Size
(LSB)
31 Number of PFA Occurrences
32 MED
PFA HDW
PFA Reserved = 0
33 - 40 Total Read Commands
41 - 48 Total Write Commands
49 Reserved = 0
50-51 Flash Correction Count