Set Features Command - Seagate EXOS 5 E Series Product Manual

6.3.2

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
F1 Report full capacity available
H
At power-on, or after a hardware or software reset, the default values of the features are as indicated above.
Note
Seagate Exos 7E8 SATA Product Manual, Rev. J 36