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Determining Disk Speed

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http://www.unix.com – Hi, I went to a computer store and the salesman sold me a SATA cable and told me that all SATA cables are the same. Another salesman at a different store told me a cable rated for SATA 2, which I bought, MIGHT work as well as one rate for SATA 3 but it is not guaranteed. I decided to run a speed test on my SSD drive to check the results. Code: dd if=/dev/zero of=/tmp/output.img bs=8k count=256k 262144+0 records in 262144+0 records out 2147483648 bytes (2.1 GB) copied, 0.530362 s, 4.0 GB/s Code: for i in 1 2 3; do hdparm -tT /dev/sda; done /dev/sda:  Timing cached reads: (HowTos)