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USB2 transfer rate to Ext HD?

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USB2 transfer rate to Ext HD?

Postby Intimidator on Sun Jan 23, 2005 4:01 pm

I have a WD20 GB HD in a USB2 external case. I was making a backup of my W2K Pro system and noticed that I was only getting 45 to 54MB/sec transfer speed when hooked up to a USB2 port. Why is this speed so slow? I
thought USB2 would provide a greater transfer rate than that.

Please Help!
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Postby dodecahedron on Sun Jan 23, 2005 4:16 pm

i might be wrong, but isn't USB2 480Mbit/sec? which equals 60MBytes/sec ?
if that's indeed the case, then 54 isn't bad.
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Postby Intimidator on Sun Jan 23, 2005 5:01 pm

You are correct....I was not sure how to make that conversion. Why do you divide 480mbps by 8 to get MB/s?
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Postby MediumRare on Sun Jan 23, 2005 5:25 pm

Intimidator wrote:Why do you divide 480mbps by 8 to get MB/s?

1 Byte = 8 bits.

G
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Postby Intimidator on Sun Jan 23, 2005 5:41 pm

That is correct....I just forgot the conversion. Thanks
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Postby Boba_Fett on Sun Jan 23, 2005 7:32 pm

Intimidator wrote:That is correct....I just forgot the conversion. Thanks


Heh, makes you wonder why everyone insists on using bits and bytes to describe the same thing. Also makes you wonder why the hell someone doesn't standardize it.
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Postby cfitz on Sun Jan 23, 2005 8:42 pm

Boba_Fett wrote:Heh, makes you wonder why everyone insists on using bits and bytes to describe the same thing. Also makes you wonder why the hell someone doesn't standardize it.

The bandwidth of a serial bus is traditionally quoted in bits per second because data is transmitted one bit at a time, while the bandwidth of a parallel bus is traditionally quoted in bytes per second because data is transmitted one (or more) bytes at a time. The nomenclature is actually pretty standardized.

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