Table of Contents
Advertisement
www.seagate.com
Set Features command
5.3.4
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 16 Set Features command values
02H
Enable write cache (default).
03H
Set transfer mode (based on value in Sector Count register).
Sector Count register values:
00H Set PIO mode to default (PIO mode 2).
01H Set PIO mode to default and disable IORDY (PIO mode 2).
08H PIO mode 0
09H PIO mode 1
0AH PIO mode 2
0BH PIO mode 3
0CH PIO mode 4 (default)
20H Multiword DMA mode 0
21H Multiword DMA mode 1
22H Multiword DMA mode 2
40H Ultra DMA mode 0
41H Ultra DMA mode 1
42H Ultra DMA mode 2
43H Ultra DMA mode 3
44H Ultra DMA mode 4
45H Ultra DMA mode 5
46H Ultra DMA mode 6
10H
Enable use of SATA features
55H
Disable read look-ahead (read cache) feature.
82H
Disable write cache
90H
Disable use of SATA features
AAH
Enable read look-ahead (read cache) feature (default).
F1H
Report full capacity available
NOTE
S.M.A.R.T. commands
5.3.5
S.M.A.R.T. provides near-term failure prediction for disk drives. When S.M.A.R.T. is enabled, the drive monitors
predetermined drive attributes that are susceptible to degradation over time. If self-monitoring determines that a failure is
likely, S.M.A.R.T. makes a status report available to the host. Not all failures are predictable. S.M.A.R.T. predictability is
limited to the attributes the drive can monitor. For more information on S.M.A.R.T. commands and implementation, see the
Draft ATA-5 Standard.
Seagate Exos X24 SATA Product Manual, Rev. A (Draft 1)
At power-on, or after a hardware or software reset, the default values of the features
are as indicated above.
Serial ATA (SATA) interface
56
Advertisement
Table of Contents
