- get/set ATA/SATA drive parameters under Linux.
| hdparm.8 (hdparm-9.58) | : | hdparm.8 (hdparm-9.60) |
|---|
| | |
| skipping to change at line 364 | | skipping to change at line 364 |
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| multiples of 5 seconds, yielding timeouts from 5 seconds to 20 min
utes. Values from 241 to 251 | | multiples of 5 seconds, yielding timeouts from 5 seconds to 20 min
utes. Values from 241 to 251 |
| specify from 1 to 11 units of 30 minutes, yielding timeouts from
30 minutes to 5.5 hours. A value | | specify from 1 to 11 units of 30 minutes, yielding timeouts from
30 minutes to 5.5 hours. A value |
| of 252 signifies a timeout of 21 minutes. A value of 253 sets a
vendor-defined timeout period | | of 252 signifies a timeout of 21 minutes. A value of 253 sets a
vendor-defined timeout period |
| between 8 and 12 hours, and the value 254 is reserved. 255 is
interpreted as 21 minutes plus 15 | | between 8 and 12 hours, and the value 254 is reserved. 255 is
interpreted as 21 minutes plus 15 |
| seconds. Note that some older drives may have very different inte
rpretations of these values. | | seconds. Note that some older drives may have very different inte
rpretations of these values. |
| | |
| --set-sector-size | | --set-sector-size |
| For drives which support reconfiguring of the Logical Sector Size,
this flag can be used to specify | | For drives which support reconfiguring of the Logical Sector Size,
this flag can be used to specify |
| the new desired sector size in bytes. VERY DANGEROUS. This most
likely will scramble all data on | | the new desired sector size in bytes. VERY DANGEROUS. This most
likely will scramble all data on |
| the drive. The specified size must be one of 512, 520, 528, 4096,
4160, or 4224. Very few drives | | the drive. The specified size must be one of 512, 520, 528, 4096,
4160, or 4224. Very few drives |
|
| support values other than 512 and 4096. | | support values other than 512 and 4096. Eg. hdparm --set-sector-
size 4096 /dev/sdb |
| | |
| -t Perform timings of device reads for benchmark and comparison p
urposes. For meaningful results, | | -t Perform timings of device reads for benchmark and comparison p
urposes. For meaningful results, |
| this operation should be repeated 2-3 times on an otherwise inacti
ve system (no other active pro- | | this operation should be repeated 2-3 times on an otherwise inacti
ve system (no other active pro- |
| cesses) with at least a couple of megabytes of free memory. T
his displays the speed of reading | | cesses) with at least a couple of megabytes of free memory. T
his displays the speed of reading |
| through the buffer cache to the disk without any prior caching of
data. This measurement is an | | through the buffer cache to the disk without any prior caching of
data. This measurement is an |
| indication of how fast the drive can sustain sequential da
ta reads under Linux, without any | | indication of how fast the drive can sustain sequential da
ta reads under Linux, without any |
| filesystem overhead. To ensure accurate measurements, the buffer
cache is flushed during the pro- | | filesystem overhead. To ensure accurate measurements, the buffer
cache is flushed during the pro- |
| cessing of -t using the BLKFLSBUF ioctl. | | cessing of -t using the BLKFLSBUF ioctl. |
| | |
| -T Perform timings of cache reads for benchmark and comparison purpos
es. For meaningful results, this | | -T Perform timings of cache reads for benchmark and comparison purpos
es. For meaningful results, this |
| | |
| skipping to change at line 560 | | skipping to change at line 560 |
|---|
| PIO data out security commands by Leonard den Ottolander, 2005. Some oth
er parts by Benjamin Benz and | | PIO data out security commands by Leonard den Ottolander, 2005. Some oth
er parts by Benjamin Benz and |
| others. | | others. |
| | |
| SEE ALSO | | SEE ALSO |
| http://www.t13.org/ Technical Committee T13 AT Attachment (ATA/ATAPI) Int
erface. | | http://www.t13.org/ Technical Committee T13 AT Attachment (ATA/ATAPI) Int
erface. |
| | |
| http://www.serialata.org/ Serial ATA International Organization. | | http://www.serialata.org/ Serial ATA International Organization. |
| | |
| http://www.compactflash.org/ CompactFlash Association. | | http://www.compactflash.org/ CompactFlash Association. |
| | |
|
| Version 9.58 October 2018
HDPARM(8) | | Version 9.60 November 2020
HDPARM(8) |
| | | |
| End of changes. 2 change blocks. |
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| 1 lines changed or deleted | | 1 lines changed or added |
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