SATA question

[Andy Burns]

Andy Burns wrote:

> Now I'm scratching my head too,

OK, having looked at hdparm man page for -T

"This  displays  the speed of reading directly from the
Linux buffer cache without disk  access.   This  measurement  is
essentially  an  indication  of the throughput of the processor,
cache, and memory of the system under test.  If the -t  flag  is
also specified, then a correction factor based on the outcome of
-T will be incorporated into the  result  reported  for  the  -t
operation."

I always though -T just repeatedly read one sectore from disk's on baord 
cache repeatedly, clearly I have always been wrong, that is what "-t" 
does :-(

I thought "-t" read a file large enough to overflow the onboard disk 
cache, so actually I'm  pleased my dmrebuild test does actually give the 
same speed.

And the difference in your 2228MB/s, my 4456MB/s and your friends 
1800MB/s are down to motherboard/cpu/memory, mine is P4 630 with dual 
DDR2 667MHz