1) Is that on a EEE 901 or an Acer Aspire?
2) Flash write speeds are (I believe) lot slower than reads... but for
flash wear reasons it's probably not a Good Idea to do extensive
testing. :-) ie. The write speed may dominate. Flash devices are
weird, they tend to have odd size pages and different size pages in
different parts of their address range.
3) You're doing buffered testing, you probably want "hdparm -t" not
"hdparm -T".
Testing an Imation 1Gb usb.
hdparm -t /dev/sdc
/dev/sdc:
Timing buffered disk reads: 44 MB in 3.06 seconds = 14.40 MB/sec
r...@parore:~# hdparm -T /dev/sdc
/dev/sdc:
Timing cached reads: 1754 MB in 2.00 seconds = 877.34 MB/sec
4) I can't think where I got the notion that the 4gb was faster... but
I got the impression the author knew something about it. I'll post the
link if I find it again.
On Mon, 2 Mar 2009, Craig Falconer wrote:
John Carter wrote, On 02/03/09 11:15:
On the 901 it has 20Gb SSD, but as far as I can determine that is
split into two logically, if not physically, distinct drives.
A faster 4Gb partition for the "root" / partition (ASUS-PHISON SSD
SOQ2882269) and and a 20gb (ASUS-PHISON SSD
SOQ2882288) slower /home partition.
Mine's not slower!
hdparm -T /dev/sda (4 GB onboard)
buffered reads: 30.85 MB/sec
hdparm -T /dev/sdb (12 GB offboard)
buffered reads: 34.21 MB/sec
hdparm -T /dev/sdc (4 GB SDHC card)
buffered reads: 14.45 MB/sec
hdparm -T /dev/sdd (32MB USB1 pen drive)
buffered reads: 942 kB/sec
hdparm -T /dev/sde (4GB USB2 Atom pen drive)
buffered reads: 27.62 MB/sec
hdparm -T /dev/sdf (8GB USB2 budget pen drive)
buffered reads: 27.66 MB/sec
So a SDHC card is still slower than a pen drive. The Imation ATOM ones are
very small and less likely to be snapped.
--
Craig Falconer
John Carter Phone : (64)(3) 358 6639
Tait Electronics Fax : (64)(3) 359 4632
PO Box 1645 Christchurch Email : [email protected]
New Zealand
