Esata hard drive is slow, why?

A common 2tb 32mb cashe sata hard drive connected to desk top pc via esata to sata cable, is there a reason?
OS: win 7 hp 64bit. System hard drive: 500gb 32mb cashe sata hard drive.

When copying files about 10gb or larger from system drive to esata drive the speed starts at or goes very fast
down to 5mb/s or lower. Can I get a higher speed?

Info: When I first started using the (empty) esata drive, the speed was mostly about 60mb "all the way".
Now the first 5-10 sec the speed may be over 100mb/s, but then goes down very fast.
If I connect another sata hard drive via usb adapter, the speed is almost always about 20mb/s.
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  1. Two possible causes that I can think of.
    1. fragmentation
    2. many small files in the large folders you are copying
  2. elel said:
    Two possible causes that I can think of.
    1. fragmentation
    2. many small files in the large folders you are copying



    reply1:I have defragmented both drives.
    2:Yes, that's the case, but should it make the speed go down 20 times?
    And shouldn't the usb speed also go down?
  3. You're right, but that's all I could think of ATM.
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