IBM Ultrastar 36LZX, Specifications

Page: 112 / 249

8.8.8 Mode Page 8 (Caching Parameters)
000000h
(MSB) Non Cache Segment Size
(LSB)
17
18,19
00h Reserved = 0 16
00h
00h (MSB) Cache Segment Size
(LSB)
14-15
0Eh Number of Cache Segments 13
00h
Reserved = 0 DRA LBCSS FSW 12
00h Maximum Pre-fetch Ceiling 10-11
FFh
FFh
Maximum Pre-fetch 8-9
00h
00h
Minimum Pre-fetch 6-7
FFh
FFh
Disable Pre-fetch Transfer Length 4-5
00h Write Retention Priority
Demand Read
Retention Priority
3
04h RCD MF WCE SIZE DISC CAP ABPF IC 2
12h Page Length = 12h 1
88h Page Code = 08h RSVD=0 PS 0
0 1 2 3 4 5 6 7
Default
Bit
Byte
Figure 88. Page 8 (Caching Parameters)
The caching parameters page defines parameters that affect the use of the cache.
Ÿ
IC (Initiator Control) is internally ignored by the Target. The Target will always use the Number of
Cache Segments or Cache Segment Size fields.
Ÿ
ABPF (Abort Pre-Fetch) is not supported. The Target aborts the pre-fetch based on the internal
algorithm.
Ÿ
CAP (Caching Analysis Permitted) is not supported and is internally ignored by the Target.
Ÿ
DISC (Discontinuity) is not supported and is internally ignored by the Target.
Ÿ
SIZE (Size Enable) bit when set to one indicates that the Cache Segment Size is to be used to
control caching segmentation. When SIZE is set to zero, the initiator requests that the Number of
Cache Segments is to be used to control caching segmentation.
Ÿ
WCE (Write Cache Enable) bit when set at zero indicates that the drive must issue Good Status for
Write(6) or Write extend(10) command only after successfully writing the data to the media. When
Ultrastar 36LZX hard disk drive specifications
112