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What is the faster connection: USB 2.0, Ultra Wide SCSI, SCSI-2??

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Old 12-17-03, 05:23 PM Thread Starter   #1
squale
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What is the faster connection: USB 2.0, Ultra Wide SCSI, SCSI-2??


Mainly I am concerned between USB 2.0 and Ultra Wide SCSI, or even Ultra3 or Ultra320 SCSI? I am looking at fast high end scanners and most use Ultra SCSI or USB 2.0 or SCSI 2, so I need to know what the fastest and then next fastest is?

I don't know if it is worth the price of buying a SCSI card? or maybe I should just get a USB 1.0 or USB 2.0 scanner?


Finanally, what is faster, SCSI-2 or USB 1.0?

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Old 12-17-03, 06:52 PM   #2
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all i know is that usb2.0 should be faster than Ultra320, and probably cheaper too, as you dont need a card. ultra 320 transfers at 320 mbs, while i believe usb2 is over 400.

The real question would be within the scanners themselves, as the speed would be more limited by the scanner itself than the way the data is transferred.

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Old 12-17-03, 07:34 PM   #3
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I'd go USB 2.0...U320 may be faster (yes in theory usb 2.0 is, but in reality U320 is much faster), but the added cost, anoyance, arn';t worth it. Also your scanner can't even scan close to 400mb/s worth of data, I would guess 50mb/s would still be more than a scanner can scan.

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Old 12-17-03, 07:46 PM   #4
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The rate on USB 2.0 is 480 Mb/s, NOT 480 MB/s. This is a factor of 8 difference. The rate for comparison is about 60MB/s and will be faster than either Ultra SCSI or SCSI-2.
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Old 12-18-03, 05:10 AM   #5
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Quote:
Originally posted by Xaotic
The rate on USB 2.0 is 480 Mb/s, NOT 480 MB/s. This is a factor of 8 difference. The rate for comparison is about 60MB/s and will be faster than either Ultra SCSI or SCSI-2.
Doesn't 60MB/s make it much slower, not faster?

And yeah, I was going to say that USB2.0 being faster than high end SCSI sounded funny...

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Old 12-18-03, 07:07 AM   #6
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Quote:
Originally posted by ajrettke
I'd go USB 2.0...U320 may be faster (yes in theory usb 2.0 is, but in reality U320 is much faster), but the added cost, anoyance, arn';t worth it. Also your scanner can't even scan close to 400mb/s worth of data, I would guess 50mb/s would still be more than a scanner can scan.
Why is USB2 only faster in theory?

Off Topic! What's faster, Firewire or USB2?
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Old 12-18-03, 07:25 AM   #7
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USB 2.0 is slower than SCSI U320 in both theory and practice, as noted above. Both the SCSI-2 and SCSI Ultra are narrow, 8bit, protocols and are much slower, rated at 10MB/s and 20MB/s respectively.

With respect to Firewire and USB 2.0, the USB is faster, in theory, at 480Mb/s(60MB/s) than the Firewire, 400Mb/s(50MB/s). Both protocols have overhead and the USB packet overhead is higher than the firewire version. As a practical matter, use whatever you have, though the USB may be more accepted. The performance is very similar.
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Old 12-19-03, 01:35 AM   #8
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Quote:
Originally posted by Xaotic
USB 2.0 is slower than SCSI U320 in both theory and practice, as noted above. Both the SCSI-2 and SCSI Ultra are narrow, 8bit, protocols and are much slower, rated at 10MB/s and 20MB/s respectively.
But SCSI-2+ comes in Wide and Narrow

I personally think the limiting factor in all this will be the scanner, and not the interface.

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Old 12-19-03, 08:04 AM   #9
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Firewire2 is faster than usb2

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