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https://www.man7.org/linux/man-pages/man8/hdparm.8.html
Values from 1 to 240 specify multiples of 5 seconds, yielding timeouts from 5 seconds to 20 minutes. 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 of 252 signifies a timeout of 21 minutes.
http://www.linux-magazine.com/Online/Features/Tune-Your-Hard-Disk-with-hdparm
Some drive properties can be changed while the device is in operation; for example, most drives allow you to turn power management on and off. Just which functions hdparm can change and activate on a hard drive can be called up with. hdparm -I /dev/sda. and are found under Commands/features (Figure 1). All functions found there and marked with ...
https://linuxconfig.org/change-hard-drive-s-sleep-standby-mode-timer-to-reduce-power-consumption
The way we specify the number of minutes is a little peculiar. The possible values are between 1-255. Multiply the value by 5 and you get the number of seconds your hard drive enters standby mode. $ sudo hdparm -S 200 /dev/sda /dev/sda: setting standby to 200 (16 minutes + 40 seconds)
https://www.geeksforgeeks.org/hdparm-command-in-linux-with-examples/
$ hdparm -A 1 /dev/sda; Command to switch the drive to the lowest degree of power management: $ hdparm -B 254 /dev/sda; Command to get current settings: $ hdparm -d /dev/sdX; Command to set DMA on for a device: $ hdparm -d1 /dev/hda; Command to lower the noise created by some classical hard disk by lowering disk performance: $ hdparm -M 128 …
https://serverfault.com/questions/29358/whats-the-effect-of-standby-spindown-mode-on-modern-hard-drives
The drive in my desktop is set to power down whenever possible (since bought 5/6 years ago) and has had a default setting of after one minute for about 2 years. In that 2 years, start/stop counts approx 39,000 have overtaken the power on hours approx 12,000, and …
https://serverfault.com/questions/259255/hdparm-poweron-standby-is-how-dangerous
jacks@Gen4:~$ sudo hdparm -s 1 -S 4 /dev/sdb /dev/sdb: Use of -s1 is VERY DANGEROUS. This requires BIOS and kernel support to recognize/boot the drive. Please supply the --yes-i-know-what-i-am-doing flag if you really want this. Program aborted. -s Enable/disable the power-on in standby feature, if supported by the drive.
https://hardforum.com/threads/post-your-hard-drive-power-on-hours.1915865/
22,230. Drive Model: WDC WD1600AAJS-22PSA0 (was used as my boot drive in an athlon x2 6400+ and phenom II x4 940 up until 3 months ago when i built my ryzen system and finally bought an SSD) [09] Power-On Hours/Cycle Count: 1/Always OK, Worst: 1 (81584 hours / …
https://hamwaves.com/hd/en/
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 of 252 signifies a timeout of 21 minutes. A value of 253 sets a vendor-defined timeout period between 8 and 12 hours. The value of 254 is reserved.
https://unix.stackexchange.com/questions/504245/s-m-a-r-t-shows-high-load-cycle-count-why-and-how-to-prevent-the-number-from
Almost one month later, I observed my hd had a LCC of 23798 and 3436 power on hours. It increased 257 cycles in 396 hours, which gives 0.65 cycles/hour. –
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