how to read "hdparm" reading?

my box have this by default: (just checked)

/dev/hda:
Timing buffer-cache reads: 128 MB in 0.35 seconds =365.71 MB/sec
Timing buffered disk reads: 64 MB in 1.11 seconds = 57.66 MB/sec

my question:

1.what's Timing buffer-cache reads
2. what's Timing buffered disk reads.
3. is there anything else i can imporve my hdparm setting?
4. i've turn keepsettings on, is that means all settings will be kept even on hardware reboot?
5. what's readonly and what does it do?

currectly my setting is
/dev/hda:
multcount = 16 (on)
IO_support = 3 (32-bit w/sync)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 1 (on)
readonly = 0 (off)
readahead = 8 (on)
geometry = 9729/255/63, sectors = 156301488, start = 0
thanks

 

 

 

 

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