USB 2.0 - General Question re Speed

paulcc · 12-16-2005, 04:51 AM

Hi

Can anyone tell me how I can check what speed my USB2.0 ports are operating at?

It's a general question as I have a couple of USB2.0 devices that just don't seem as fast as I'd been lead to believe USB2.0 to be.

Thanks

Paul

**please** · 12-16-2005, 09:38 AM

@ paulcc
USB1.1 theoretical speed is 12Mbits/s=1.5MBytes/s. Actual speed is less

USB2.0 theoretical speed is 480Mb/s=60MB/s. Actual speed is less, usually 40MB/s at best, depending on your device and system/CPU strength. Some flash drives like my Sandisk Cruzer Mini 256MB only have a transfer rate of about 8MB/s.

You can check your transfer rate speed with many different devices and utilities like HDTach for HDDs and flash drives or Nero CD-DVDSpeed transfer rate test and burst rate test for OpticalDiskDrives.

12-16-2005, 04:51 AM	#1 (permalink)
paulcc Registered User Join Date: Oct 2004 Location: Bolton, UK Posts: 41 OS: XP Home SP2	USB 2.0 - General Question re Speed Hi Can anyone tell me how I can check what speed my USB2.0 ports are operating at? It's a general question as I have a couple of USB2.0 devices that just don't seem as fast as I'd been lead to believe USB2.0 to be. Thanks Paul

12-16-2005, 09:38 AM	#2 (permalink)
please Tech Join Date: Mar 2005 Posts: 1,185 OS: WinXP SP2	@ paulcc USB1.1 theoretical speed is 12Mbits/s=1.5MBytes/s. Actual speed is less USB2.0 theoretical speed is 480Mb/s=60MB/s. Actual speed is less, usually 40MB/s at best, depending on your device and system/CPU strength. Some flash drives like my Sandisk Cruzer Mini 256MB only have a transfer rate of about 8MB/s. You can check your transfer rate speed with many different devices and utilities like HDTach for HDDs and flash drives or Nero CD-DVDSpeed transfer rate test and burst rate test for OpticalDiskDrives. __________________ P4P800E-D:~:P4 3.0C@3.75GHz:~:Zal7000AlCu:~:OCZ4001024ELDCPER2-K@250MHz 2.5-3-3-7 WinXP SP2>2X160GB Samsung SATA ICH5R RAID1:~:2x80GB Samsung SATA Promise RAID0 ATI A-I-W X800XT~SB Audigy2 ZS~2X BenQ1620~Antec SLK3700AMB~Antec SmartPower2.0 500W Last edited by please; 12-16-2005 at 09:44 AM.