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Source code changes of the file "hdparm.8" between
hdparm-9.58.tar.gz and hdparm-9.60.tar.gz

About: hdparm - 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
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
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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)
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