14年前（2007 年）的笔记本的 HDD 和插在 USB 口的 HDD 移动硬盘的读写速度测试结果

HDD:

$ dd if=/root/tmp.data of=/dev/null bs=1024k
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 190.078495 secs (22595756 bytes/sec)
$ dd if=/dev/random of=/root/tmp.data bs=1024k count=4096
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 200.241032 secs (21448987 bytes/sec)

Read speed: 21.54 Megabyte per second
Write speed: 20.45 Megabyte per second

HDD @ USB:

$ dd if=/dev/random of=/tank/tmp.data bs=1024k count=1024
1024+0 records in
1024+0 records out
1073741824 bytes transferred in 100.581317 secs (10675361 bytes/sec)
$ dd if=/tank/tmp.data of=/dev/null
2097152+0 records in
2097152+0 records out
1073741824 bytes transferred in 43.525504 secs (24669257 bytes/sec)

Read speed: 23.52 Megabyte per second
Write speed: 10.18 Megabyte per second