> I can confirm this behavior with my T43 Thanks for confirming. So now we'll have to determine sane default values. I did some very unscientific tests using the command
smartctl -d ata -a /dev/sda | grep 193; hdparm -B 180 /dev/sda; sleep 600; \ smartctl -d ata -a /dev/sda | grep 193; hdparm -B 255 /dev/sda and continuing to work normally. After 10 minutes I checked the output. Here are some values: -B 128 -> 23 cycles in 10 minutes -B 160 -> 29 in 10' -B 180 -> 0 in 10' -B 196 -> 0 in 10' -B 200 -> 0 in 10' So even -B 160 leads to 3 cycles per minute (180 per hour), leading to a lifespan of 600,000/180/24=139 days (of continuous battery powered use). Note that only a few years ago 300,000 load/unload cycles was a common value. What is remarkable is the sharp drop between 180 and 196. Could somebody else report some values for his system? Does anyone know how the -B parameter is interpreted or is that left up to the device? -- default value in power.sh potentially kills laptop disks https://launchpad.net/bugs/59695 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
