jaraeez Posted July 7, 2007 Report Share Posted July 7, 2007 (edited) Hi, I've just purchased a USB 2.0 speed HD & was wondering what speeds I should get when copying over something. I'm not to sure which of my USB ports are 1.1 & which are 2.0. At the moment I manage speeds around 7.4 MB/s - would this be right for 2.0 & if not what speeds should I be getting? TIA Just noticed that when I copy a file using ntfs-3g on one partition I get 17.5 MB/s though when copying to a ext3 I get the above mentioned speed (7.4 MB/s)?? Edited July 7, 2007 by jaraeez Quote Link to comment Share on other sites More sharing options...
Greg2 Posted July 7, 2007 Report Share Posted July 7, 2007 I've just purchased a USB 2.0 speed HD & was wondering what speeds I should get when copying over something. The truth is that USB 2.0 is not necessarily faster, because USB 2.0 is a standard, not a benchmark. There are three speeds for data transfer via USB interface: USB Low-Speed - transfer speed of 1.5 Mbits/second USB Full-Speed - transfer speed of 12 Mbits/second USB High-Speed - transfer speed of 480 Mbits/second Plug in your USB HD, and in terminal do dmesg |grep USB this should show you something like this: usb 1-1: new full speed USB device using ohci_hcd and address 2 the ohci_hcd on address 2 shows you that it's not 2.0, but 1.1 usb 4-2: new high speed USB device using ehci_hcd and address 3 the ehci_hcd shows you this is 2.0. Now do dmesg |grep usb and you should see something like this usb 4-2: new high speed USB device using ehci_hcd and address 3 usb 4-2: configuration #1 chosen from 1 choice usbcore: registered new driver usb-storage usb-storage: device found at 3 usb-storage: waiting for device to settle before scanning usb-storage: device scan complete this shows you that your USB storage device is connected at address 3, which is 2.0 high speed. For the record I get 31 to 32MB/s transfer speeds with my USB 2.0 HD... which is the one I've just attached to show you this. I should also note that these speeds will very with different motherboards, chipsets, HDs and file systems. Quote Link to comment Share on other sites More sharing options...
jaraeez Posted July 7, 2007 Author Report Share Posted July 7, 2007 Cheers for the heads up Greg. Well it looks like it's using high speed 2.0 dmesg |grep USB SLOT KBC0 MSE0 PWRB USB4 USB1 USB2 USB3 USB Universal Host Controller Interface driver v3.0 uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 1 hub 1-0:1.0: USB hub found uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 2 hub 2-0:1.0: USB hub found uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 3 hub 3-0:1.0: USB hub found uhci_hcd 0000:02:0b.0: new USB bus registered, assigned bus number 4 hub 4-0:1.0: USB hub found uhci_hcd 0000:02:0b.1: new USB bus registered, assigned bus number 5 hub 5-0:1.0: USB hub found ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 6 ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004 hub 6-0:1.0: USB hub found ehci_hcd 0000:02:0b.2: new USB bus registered, assigned bus number 7 ehci_hcd 0000:02:0b.2: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004 hub 7-0:1.0: USB hub found usb 6-6: new high speed USB device using ehci_hcd and address 2 Initializing USB Mass Storage driver... scsi0 : SCSI emulation for USB Mass Storage devices USB Mass Storage support registered. dmesg |grep usb usbcore: registered new driver usbfs usbcore: registered new driver hub usb usb1: configuration #1 chosen from 1 choice usb usb2: configuration #1 chosen from 1 choice usb usb3: configuration #1 chosen from 1 choice usb usb4: configuration #1 chosen from 1 choice usb usb5: configuration #1 chosen from 1 choice usb usb6: configuration #1 chosen from 1 choice usb usb7: configuration #1 chosen from 1 choice usbcore: registered new driver ndiswrapper usb 6-6: new high speed USB device using ehci_hcd and address 2 usb 6-6: configuration #1 chosen from 1 choice usbcore: registered new driver usb-storage usb-storage: device found at 2 usb-storage: waiting for device to settle before scanning usb-storage: device scan complete & i suppose 17MB/s is probably the best I'm going to get with my H/W I have two partitions on a 250GB external HD (100GB = NTFS, & 130GB ext3) I noticed that on the slower of the partitions (ext3) it shows as journaling=ordered where I have the option of ordered, all data, or write back. Could this option be the problem with the slower transfer speeds on the ext3 partition? cheers Quote Link to comment Share on other sites More sharing options...
Greg2 Posted July 7, 2007 Report Share Posted July 7, 2007 I noticed that on the slower of the partitions (ext3) it shows as journaling=ordered where I have the option of ordered, all data, or write back. Could this option be the problem with the slower transfer speeds on the ext3 partition? Yes, writing to a journaled file system via USB would be slower. In all fairness I should add that my faster transfer speeds were to a FAT32 file system. :) Quote Link to comment Share on other sites More sharing options...
jaraeez Posted July 7, 2007 Author Report Share Posted July 7, 2007 Yes, writing to a journaled file system via USB would be slower. In all fairness I should add that my faster transfer speeds were to a FAT32 file system. :) lol.. well thanks again. The problem I have with FAT32 is that I have some VMware images I copy back & forth which are over 8GB each & from my understanding FAT32 has a file limatation of 4GB? Quote Link to comment Share on other sites More sharing options...
Greg2 Posted July 7, 2007 Report Share Posted July 7, 2007 from my understanding FAT32 has a file limatation of 4GB? Yes, it will stop the transfer at 3.99GB. :P Quote Link to comment Share on other sites More sharing options...
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