Hitachi ULTRASTAR 15K450 HUS154530VLF400 - Manual (Page 188)

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
172
19.10.2 Mode Page 00 (Vendor Unique Parameters)
Table 147: Vendor Unique Parameters - Page 00
Fields marked in the table as 'Ignored' are not used or checked by the drive. They will be initialized to zero but can be set as
desired for compatibility with older drives.
• MRG (Merge Glist into Plist) bit is set to 1 for merging the Glist entries into the Plist during FORMAT UNIT command.
• VGMDE (Veggie Mode) bit set to 1 will cause the drive to execute random self-seeks. To enable this mode, the initiator
must perform the mode select to set the bit while the drive is spinning, then Stop Unit, then Start Unit. VGMDE set
to 0 disables the self-seeks (normal operation).
• RRNDE (Report Recovered Non Data Errors) bit controls the reporting of recovered Non Data Errors when the PER bit
is set. If RRNDE is set, recovered Non Data Errors are reported. If the RRNDE bit is not set, then recovered Non
Data Errors are not reported.
• FDD (Format Degraded Disable) controls the reporting of Format Degraded sense data for Test Unit Ready commands
when the drive is in a format degraded state. When the FDD bit is one, Format Degraded sense data will not be
reported for a Test Unit Ready command. When the FDD bit is zero, Format Degraded sense data will be reported
for Test Unit Ready commands when the drive is in a format degraded state. This bit does not affect the reporting of
Format Degraded conditions for any media access commands.
• CAEN (Command Aging Enable) When set this bit causes the Command Age Limit timer to be used to avoid commands
waiting in the command queue for an indefinite period. When commands have been in the queue for a period of time
greater than the timer limit they will be reordered to be executed on a first come first served basis. When this bit is
reset, commands are always executed based on the queue reordering rules.
Byte
Bit Default
7 6 5 4 3 2 1 0
0 PS 0 Page Code = 00h 80h
1 Page Length = 0Eh 0Eh
2 Ignored MRG Ignored 00h
3 Ignored VGMDE Ignored RRNDE Ignored 00h
4 Ignored 00h
5 Ignored FDD Ignored CAEN Ignored 02h
6 IGRA AVERP Ignored OCT (high nibble) 00h
7 Overall Command Timer (low byte) 00h
8 Ignored 00h
9 Temperature Threshold 00h
10 Command Aging Limit (Hi byte) 00h
11 Command Aging Limit (Low byte) 30h
12 Read Reporting Threshold 0Ah
13 Write Reporting Threshold 0Ah
14 DRRT Ignored FFMT Ignored 00h
15 Ignored FCERT BYPS HIM Ignored Reserved = 0 00h