jak hdparm -T vypovida o rychlosti?

[Libor Štefek]

po tom co jsem doma na svem PC s Celeronem 433 / 64MB / noname deska/IDE disk
pustil hdparm -tT a zkousel trochu doladit parametry, mam stale trochu neprijemny pocit.
Puvodni stav byl:
hdparm -tT bez nastavování, tj.  -c 0 -d 0 -m 0
44 MB/s paměť , 3.4 MB/s disk
Po trose ladeni:

/dev/hda:
 multcount    =  4 (on)
 I/O support  =  1 (32-bit)
 unmaskirq    =  0 (off)
 using_dma    =  0 (off)
 keepsettings =  0 (off)
 nowerr       =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 787/64/63, sectors = 3173184, start = 0

 Timing buffer-cache reads:   128 MB in  2.95 seconds =44.2 MB/sec
 Timing buffered disk reads:  64 MB in 12.03 seconds = 5.32 MB/sec

To cteni z disku bych i bral, ale co tech 44 MB/s pro cteni pameti !?
Neni to trochu malo na ty MegaHertzy?
(pozn.: pokus o -d 1 nevyšel, hláška :
/dev/hda:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operace není povolena
 using_dma    =  0 (off)
- to je boardem ?)
pouzivam distribuci RedHat 6.1cz.

s pozdravem Libor Štefek