Jul 28: eSATA against USB2 on my new laptop
I'm using a new laptop with an eSATA connector, along with a hard disk docking station. I thought I'd run some hdparm tests to see what the difference in data transfer between the two methods would be.
The first is the locally installed SATA 5400 RPM 640GB drive. The second is the external 1TB drive connected via eSATA. The last scoring is for the same drive connected via USB. That's quite a drop in throughput we're looking at there when the cache is taken out of the equation.
root@ruby:/home/james# hdparm -Tt /dev/sda6
/dev/sda6:
Timing cached reads: 5798 MB in 2.00 seconds = 2899.53 MB/sec
Timing buffered disk reads: 222 MB in 3.01 seconds = 73.73 MB/sec
root@ruby:/home/james# hdparm -Tt /dev/sdb1
/dev/sdb1:
Timing cached reads: 5414 MB in 2.00 seconds = 2707.37 MB/sec
Timing buffered disk reads: 270 MB in 3.01 seconds = 89.82 MB/sec
root@ruby:/home/james# hdparm -Tt /dev/sdf1
/dev/sdf1:
Timing cached reads: 5314 MB in 2.00 seconds = 2658.02 MB/sec
Timing buffered disk reads: 94 MB in 3.06 seconds = 30.70 MB/sec
The first is the locally installed SATA 5400 RPM 640GB drive. The second is the external 1TB drive connected via eSATA. The last scoring is for the same drive connected via USB. That's quite a drop in throughput we're looking at there when the cache is taken out of the equation.
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