screen blanking: what window manager or desktop environment are you using?? if you're using KDE, there's options for this in the control center, under "Display Power Control"...
hard disk spin-down: you can try doing it with hdparm
and the -S
here's what "man hdparm" says:
Set the standby (spindown) timeout for the drive. This value is used by the drive to deter_mine how long to wait (with no disk activity) before turning off the spindle motor to save power. Under such circumstances, the drive may take as long as 30 seconds to respond to a subsequent disk access, though most drives are much quicker. The encoding of the timeout value is somewhat peculiar. A value of zero means "timeouts are disabled": the device will not automatically enter standby mode. 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. 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 sec_onds. Note that some older drives may have very different interpretations of these values.
so, for example, this would spin-down /dev/hda
after 20 minutes of inactivity:
hdparm -S240 /dev/hda
just my two cents...