Stephen Harris wrote:
On Tue, Jan 23, 2007 at 04:38:27PM +0100, David Hrb???? wrote:
Timing buffered disk reads: 70 MB in 3.03 seconds = 23.14 MB/sec
That's pretty slow. Comparing to traditional EIDE disks, that's around UDMA2 speeds (a UDMA2 disk on a Dell P3-800 gives 20MB/sec). My USB2 enclosures are faster than that (30MB/sec on a Shuttle AMD-2500).
Timing buffered disk reads: 146 MB in 3.02 seconds = 48.35 MB/sec
That's closer to UDMA5 speeds (approx 55MB/sec on both machines).
All in all, not very impressive!
For comparison: root@Bandicoot:~# hdparm -Tit /dev/hda
/dev/hda:
Model=ST3160212A, FwRev=3.AAJ, SerialNo=4LS4ZQ3R Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4 BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=off CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 AdvancedPM=no WriteCache=enabled Drive conforms to: Unspecified: ATA/ATAPI-1 ATA/ATAPI-2 ATA/ATAPI-3 ATA/ATAPI-4 ATA/ATAPI-5 ATA/ATAPI-6 ATA/ATAPI-7
* signifies the current active mode
Timing cached reads: 1152 MB in 2.00 seconds = 574.67 MB/sec Timing buffered disk reads: 182 MB in 3.06 seconds = 59.40 MB/sec root@Bandicoot:~#
The drive's pretty new, the BIOS is dated Dec 2004, and the mobo is an ASUS A7V400-MX (cheap all-in one, Via chipset), the CPU AMD Sempron(tm) 2400+.