Set Features Command - Seagate Exos Enterprise ST18000NM0092 Product Manual

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4.3.4

Set Features command

This command controls the implementation of various features that the drive supports. When the drive receives this
command, it sets BSY, checks the contents of the Features register, clears BSY and generates an interrupt. If the value
in the register does not represent a feature that the drive supports, the command is aborted. Power-on default has the
read look-ahead and write caching features enabled. The acceptable values for the Features register are defined as
follows:
Table 14 Set Features command values
02 Enable write cache (default).
H
03 Set transfer mode (based on value in Sector Count register).
H
Sector Count register values:
00 Set PIO mode to default (PIO mode 2).
H
01 Set PIO mode to default and disable IORDY (PIO mode 2).
H
08 PIO mode 0
H
09 PIO mode 1
H
0A PIO mode 2
H
0B PIO mode 3
H
0C PIO mode 4 (default)
H
20 Multiword DMA mode 0
H
21 Multiword DMA mode 1
H
22 Multiword DMA mode 2
H
40 Ultra DMA mode 0
H
41 Ultra DMA mode 1
H
42 Ultra DMA mode 2
H
43 Ultra DMA mode 3
H
44 Ultra DMA mode 4
H
45 Ultra DMA mode 5
H
46 Ultra DMA mode 6
H
10 Enable use of SATA features
H
55 Disable read look-ahead (read cache) feature.
H
82 Disable write cache
H
90 Disable use of SATA features
H
AA Enable read look-ahead (read cache) feature (default).
H
F1H Report full capacity available
NOTE
Seagate Exos 2X18 SATA Product Manual, Rev. A
At power-on, or after a hardware or software reset, the default values of the
features are as indicated above.
Serial ATA (SATA) interface
47