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Testing a USB 2.0 port for True 480Mbos speed

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August 23, 2006 3:44:05 AM

Hi dear, i just bought USB 2.0 hard drive enclosure but it was one of those off brand products that i got from ebay. what bugs me is that there is no icon saying it is USB 2.0 even though the seller stated it is. my question is if there is any way you can test a device or a USB port on your computer to see if it reaches USB 2.0 specs of 480Mbps. thanks
August 23, 2006 7:25:21 PM

Just because someone says something is USB 2.0 doesn't mean that it will work at 480Mbps. It should work at more than USB 1.1 speeds (12Mbps).

Here's a crude way to do it:
Find a big file or a bunch of files that are about 100MB in size.
Get a stopwatch or use a clock w/ seconds.
Drag them over to your USB hard drive.
Time how long it takes to finish. (make sure you're not doing anything else w/ the computer at the same time)
Convert that time into seconds.
Divide the file size (100MB by the time in seconds).
Multiply by 8 to get Mbps.

If the end number is greater than 12, its USB 2.0.

You'll probably notice it right away - if the 100MB of files takes over 60 seconds to transfer, you probably have 1.1.
August 23, 2006 7:36:05 PM

thanks for the feedback.
i tested it and i got 108 for a 108MB file. so i guess i am getting the real deal.
also i was just wondering why i had to multiply by 8?
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August 23, 2006 7:48:34 PM

yiushock:
So you're getting 108Mbps? The reason why you had to multiply by 8 is because we transfered a 100MB (megabyte) file. But USB 2.0 is rated at 480Mbps (megabits per second). There are 8bits in 1 byte, so to convert MB/s to Mbps, 1MB/s = 8Mbps.

Unfortunately with alot of no-name external HDD products coming out, alot of them don't post real speeds, they just blanket it under USB 2.0. What I do is research around on the internet to find out how fast it really is from other people that test it. Even finding a product in the same family is good enough for the most part - it shouldn't differ that much. Google works the best.

mpilchfamily:
Hard drives come close... 480Mbps = 60MB/s. That's about an average HDD's rate. However this depends on if your system can spit out and sustain that much data at once.
Flash memory is getting closer too.
August 24, 2006 1:38:23 AM

thanks alot
August 24, 2006 2:15:53 AM

Hey NObly, thanks for those posts man. I always wondered the same thing about usb.

Now I"M gonna go test mine. he he

RIG specs
Antec P180 PerformanceSeries Mid-Tower Case
SeaSonic S12 600 watt power supply
Asus A8N32 SLI mobo socket 939 AMD N-Force 4 SLIX16 (bios 1103 V02.58)
RealTek 97 onboard digital 5.1 Surround
AMD Athlon 64 X2 4800+ Toledo Core, 2 X 1mb L2 cache (AMD driver 1.3.1.0 w/MS hotfix & AMD Dual Core Optimizer)
2 gigs of Corsair TwinX3500LL Pro @ 437Mhz 2-3-2-6-1T
2- BFG 7900 GT OC 256mb in SLI (nvidia driver 91.31)
Western Digital RAPTOR 74.3 gig 10-K rpm HDD for XP & Apps
Maxtor SATA II 250 G HDD for gaming, movies, MP3's
Maxtor SATA II 250 G HDD for document backup (unplugged)
Sony CDrom 52X
Plextor 708-A DVD/CD rom
Logitech Z-5500 Digital 5.1 THX 500watts
August 24, 2006 5:59:27 PM

No problemo people.
This is why this forum exists.
:) 
!