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Please don’t forget to mount your hard disk first! Test of read/ write speeds of USB hard disks
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using hdparm Input:
hdparm -Tt /dev/sda
Output like this: /dev/sda:
Timing cached reads: 724 MB in 2.00 seconds = 361.20 MB/s
Timing buffered disk reads: 88 MB in 3.03 seconds = 29.05 MB/s
read 724 MB cache in 2 seconds ,the speed is about 361.20 MB/s read 88 MB disk in 3.03 seconds(Physical reads) ,the speed is about 29.05 MB/s 2.using dd ①write speed Input:
# dd if=/dev/zero of=./largefile bs=5M count=1024
Output like this:
1024+0 records in
1024+0 records out
5368709120 bytes (5.4 GB) copied,522.167 s,10.3 MB/s
the write speed is about 10.3 MB/s ②read speed Input:
# dd if=./largefile of=/dev/null bs=5M count=1024
Output like this:
1024+0 records in
1024+0 records out
536870910 bytes (5.4 GB) copied,183.948 s,29.2 MB/S
the read speed is about 29.2 MB/s Test of read/ write speeds of SATA hard disks 1.using hdparm Input:
# hdparm -t /dev/sda
Output like this: /dev/sda:
Timing buffered disk reads: 322 MB in 3.01 seconds = 106.83 MB/sec
read 322 MB disk in 3.01 seconds(Physical reads) ,the speed is about 106.83 MB/s
2.using dd ①write speed Input:
# dd if=/dev/zero of=./largefile bs=5M count=1024
Output like this:
1024+0 records in
1024+0 records out
5368709120 bytes (5.4 GB) copied,134.729 s,39.8 MB/s
Copy the Codethe write speed is about 39.8MB/s ②read speed Input:
# dd if=./largefile of=/dev/null bs=5M count=1024
Output like this:
1024+0 records in
1024+0 records out
5368709120 bytes (5.4 GB) copied,65.3293 s,82.2 MB/s
the read speed is about 82.2MB/s