writingspeed for external hard drive

I have an exsternal hard drive (WD My Book Studio Edition - 500 GB - 3 years old) that has USB, e-Sata, and Firewire connections. Recently I copied my dekstop (41.3 GB) jpg files, and with USB, I got only 2.2 MB/s. Then, I tried the e-Sata and got only 3.2 MB/s. Finally, I tried the Firewire connection and got 4.1 MB/s max. If labor took hours.

In the specification for the disc, the transferspeeds are supposed to be up to 480 MB/s (USB), 400 Mbps (Firewire) and 3 GB/s (e-Sata). Is there something wrong with the WD drive, or is it a problem? Or is this normal?

You can be misled by the confusion between the bits and bytes, but, even if it seems low.

The USB 2.0 transfer rate is 480 Mbps or 60MBytes/sec. When you take into account overhead, this amounts to about 35MBytes/s. It would be streaming to and from the buffer of the device; If the disk head moves track in track, things will be slowing down a lot. In your case, I guess you have been copying a lot of files. As well as the files themselves, you would add entries to the directory, so the heads would be moving between the data in the file and the directory. In addition, there is the NTFS journal. All this activity will slow things down.

Tags: Windows

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