A little benchmarking
I installed my new desktop PC (Gigabyte GA-MA78GM-S2H motherboard, AMD Athlon X2 4850e processor, Kingmax 2GB DDR2 800 MHz) and since the motherboard has an eSATA connector I was able to use my WD My Book Home external drive via it's eSATA connection. I was playing a bit and did some benchmarking and tested actual file copying speed with some of my HDD's. I tested my:
- Western Digital My Book Essential 250GB external HDD (USB2)
- Western Digital My Book Home 1T external HDD (USB2 and eSATA)
- Seagate 500GB 32MB SATA internal HDD
- Samsung SP2504C 250GB 8MB SATA internal HDD.
First I run two hard disk drive benchmarking tools: the aged ATTO Disk Benchmark and HD Tune. Then I copied a 640MB file with Windows Explorer (native) and with TeraCopy free version (2.0 beta 4) and measured the time it took to copy. Then I did the same with 4 files altogether measuring 5,57GB. I gave copy speed in MB/s, actual time is in brackets. Here are the results:
Western Digital My Book Essential 250GB (USB2) [free space: 3%]


Copy test: 
Western Digital My Book Home 1T (USB2) [free space: 76%]


Copy test: 
Western Digital My Book Home 1T (eSATA) [free space: 76%]


Copy test: 
Seagate 500GB (internal SATA) [free space: 95%]


Copy test: 
Samsung 250GB (internal SATA) [free space: 6%]


Copy test: 
Summary, conclusion?
It is very hard to draw any conclusion because there are so many factors affecting data transfer rate and because of the inaccuracy in measurement.
It seems that:
- TeraCopy increases copy speed, especially when copying larger files; on my internal Seagate HDD it was 1.5-1.7x faster
- WD My Book Home eSATA interface is approximately twice as fast as it's USB2 interface.
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