Operations
6-20
C141-E104-03EN
4) Finally, the cache data in the buffer is as follows.
Read-ahead data
c.
Non-sequential command immediately after sequential command
When a sequential read command (first read) has been executed, the first
read operation should be stopped if a non-sequential read command has
been received and then, ten or more of the non-sequential read
commands have been received. (Refer to 6.5.3.1.)
The figure that describes the first read operation is the same as that
shown in the sub-section a.
6.5.3.3 Full hit (hit all)
All requested data are stored in the data buffer. The disk drive starts transferring
the requested data from the address of which the requested data is stored. After
completion of command, a previously existed cache data before the full hit
reading are still kept in the buffer, and the disk drive does not perform the read-
ahead operation.
1) In the case that the contents of the data buffer is as follows for example and
the previous command is a sequential read command, the disk drive sets the
HAP to the address of which the hit data is stored.
HAP (set to hit position for data transfer)
Last position at previous read command
Last position at previous read command
Cache data
Full hit data
Cache data
0
2) The disk drive transfers the requested data but does not perform the read-
ahead operation.
(stopped)
HAP
Cache data
Full hit data
Cache data
HAP
DAP
Last LBA
Start LBA
Содержание DISK DRIVES MHL2300AT
Страница 1: ...C141 E104 03EN MHL2300AT MHM2200AT MHM2150AT MHM2100AT DISK DRIVES PRODUCT MANUAL ...
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Страница 40: ...3 1 Dimensions C141 E104 03EN 3 3 Figure 3 1 Dimensions MHM series 2 2 ...
Страница 52: ...3 4 Jumper Settings C141 E104 03EN 3 15 Figure 3 16 Example 2 of Cable Select drive drive ...
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Страница 185: ...Interface 5 108 C141 E104 03EN Figure 5 10 Data transfer timing ...
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