Speed is slow

WD External Drives WD Portable Drives
1

I have a WD Passport Essential SE 1TB which is compatible  with the USB 3.0.

At first use, transfer speed would reach around 60 MBps but now, it ony reaches around 40MBps. I dont know what’s wrong.

Help me. :c

2

Hello,

Have you test your drive using a different computer? Did you get the same transfer rate?

3

Transfer speed would drastically vary on type of files you’re coping. Here is an example of My Passport Essential SE 1TB,

CrystalDiskMark 3.0.1 (C) 2007-2010 Crystal Dew World : http://crystalmark.info/

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read :    28.898 MB/s

Sequential Write :    22.889 MB/s

Random Read 512KB :    12.639 MB/s

Random Write 512KB :    22.143 MB/s

Random Read 4KB (QD=1) :     0.466 MB/s [   113.7 IOPS]

Random Write 4KB (QD=1) :     0.779 MB/s [   190.1 IOPS]

Random Read 4KB (QD=32) :     0.528 MB/s [   128.9 IOPS]

 Random Write 4KB (QD=32) :     0.834 MB/s [   203.6 IOPS]

Test : 1000 MB [W: 21.2% (197.7/930.9 GB)] (x5)

Date : 2011/02/07 1:06:29

OS : Windows 7 Ultimate Edition [6.1 Build 7600] (x86)