Kingston 64GB U盘

搞了一个大一点的U盘, 容量 64GB, 之前买了几个便宜货, 结果要么容量没有写的多, 要么就是写着写着文件就读不出来了, 所以这次还是搞了一个牌子还不错的, 金斯顿.

kingston-64gb-usb-unpacked

写着容量是 64GB 但是只有 58.5G 左右, 因为商家总是喜欢把 1000MB当成是1G, 而在计算机中, 用的是2的10次方 1024.

kingston-64gb-usb

我们可以用第三软件 (zip 压缩包, 双击运行, 不能解压) usbcheck tool 来测试U盘的质量.

h2test2 usb check tool

原理就是先向U盘写满数据文件, 然后再读出来验证. 需要一会时间, 好牌子果然质量可以得到保障.

usb-check-finish

下一步就是测测读写速率了 (有空再更新)

pi@raspberrypi:~$ sudo hdparm -tT /dev/sda1

/dev/sda1:
 Timing cached reads:   312 MB in  2.01 seconds = 155.43 MB/sec
 Timing buffered disk reads:  70 MB in  3.02 seconds =  23.18 MB/sec

在 windows 命令行下, 可以通过 winsat disk -drive 盘符 来对磁盘(U盘等)进行读写测试:

C:\Windows\System32>winsat disk -drive g
Windows System Assessment Tool
 Running: Feature Enumeration ''
 Run Time 00:00:00.00
 Running: Storage Assessment '-drive g -ran -read'
 Run Time 00:00:01.26
 Running: Storage Assessment '-drive g -seq -read'
 Run Time 00:00:05.38
 Running: Storage Assessment '-drive g -seq -write'
 Run Time 00:00:49.16
 Running: Storage Assessment '-drive g -flush -seq'
 Run Time 00:00:11.17
 Running: Storage Assessment '-drive g -flush -ran'
 Run Time 00:00:13.22
 Disk  Random 16.0 Read                       14.07 MB/s          5.6
 Disk  Sequential 64.0 Read                   30.84 MB/s          4.4
 Disk  Sequential 64.0 Write                  12.87 MB/s          3.1
 Average Read Time with Sequential Writes     4.865 ms          6.0
 Latency: 95th Percentile                     6.082 ms          6.4
 Latency: Maximum                             1385.036 ms          1.9
 Average Read Time with Random Writes         5.742 ms          5.8
 Total Run Time 00:01:23.30

作为参考, 我的另一个 Micro SHDC 金斯顿的卡, 读写速度则非常慢:

slowest-usb-sd-card-speed

当然有可能和 USB Adapter 有关, 或许是 USB 1.x 的 (最大速率 12Mbps)

英文同步: https://helloacm.com/review-kingston-usb-64-gb/