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Iomega HDD 20 GB in the test: External hard drive for USB 2.0

Iomega HDD 20 GB in the test: External hard drive for USB 2.0

Access times

The access time (the time that elapses between a data request and the actual sending of the data) is also very important . Our USB 1.1 thumbdrive with 32 MB is again part of this test.

Access times
  • Access to the first 500MB:
    • Thumb Drive USB
      6.00
    • IBM IC35
      6,78
    • IBM DTLA
      7.07
    • IBM IC35 - Low Noise
      7.51
    • IBM DTLA - Low Noise
      8,32
    • IBM DJNA
      9.00
    • Iomega HDD
      11.81
    • Iomega HDD - No Cache
      12,16
    • Iomega HDD - USB 1.1
      15.46
  • Average access:
    • Thumb Drive USB
      6.00
    • IBM IC35
      12.33
    • IBMDTLA
      12.62
    • IBM DJNA
      13.11
    • Iomega HDD
      19.02
    • Iomega HDD - No Cache
      19.27
    • IBM IC35 - Low Noise
      19,34
    • IBM DTLA - Low Noise
      22,34
    • Iomega HDD - USB 1.1
      22.55

Since the USB memory stick is not a hard drive as such, its access times are well ahead of the others. The Iomega can only live up to the promises made by IBM (hardware/technology) when accessing the first 500 MB. The influence of the hard disk operating mode is particularly noticeable in this context. This is because the quiet mode is only generated by slowly moving the reading head back and forth, which understandably noticeably affects the access time. With the average access time, even IBM's high-end hard drive in low-noise mode has to be able to beat it.

Processor load

The processor load is actually negligible with current mainboards, since the DMA operation direct accesses are possible without the aid of the processor. However, since this is not the case with USB, this test is quite interesting.

CPU load
Unit: percent
    • Iomega HDD
      12.7
    • Iomega HDD - No Cache
      11,2
    • IBM IC35
      2,6

As was to be expected, the USB 2.0 hard drive loads the processor much more than normal desktop hard drives do. However you can hereDo not blame any party, as it is simply not possible to leave the processor uninvolved with such high transfer rates via the USB. Incidentally, all the other comparison plates provided hardly measurable results of one percent.

On the next page: Working speed