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Old 01-19-2004, 01:27 PM   #1
baronlynx
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Question How to get the USB 2.0 transfer to/from the external hdd?


hi to all,

i recently installed RH9 (2.4.20-8 kernel) and i got the extenal box for a 3.5 hdd fire wire and usb2.0 and a segate 7200rpm, 80GB inside

i got it running on the usb cable since the equipped firewire cable is 6-6 not a 6-4, so i cannot connect it to my laptop

the hardware browser says that i have SiS7002 USB2.0 with a driver ehci-hcd

but i got read transfers from it averaging 950 kB/s, so it looks like having a USB1.1 transfers
using a
hdparm -t /dev/sda
command

how to turn on the usb 2.0 support?
i have seen it somewhere but of course wasn't so smart to note it ...

--baronlynx--
 
Old 01-19-2004, 02:07 PM   #2
Tinkster
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Re: How to get the USB 2.0 transfer to/from the external hdd?

Quote:
Originally posted by baronlynx
[but i got read transfers from it averaging 950 kB/s, so it looks like having a USB1.1 transfers
using a
hdparm -t /dev/sda
usb 1.1 would be more like 130KB/s ...


Cheers,
Tink
 
Old 01-19-2004, 02:23 PM   #3
baronlynx
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thanks Tinkster for reminding me that

but anyway the maximal transfers rates of usb2.0 is 480Mbps (~60MB/s) isn't it ? so it is >60times much faaaaster.

plz post some some of your external hdd performance tests (both connected by usb and firewire)...
it will help me decide whether to buy a firewire 6-4 cable or stay with usb
or
maybe i just demand too much from that lil' box

thanx 2 all

--baronlynx--
 
Old 01-19-2004, 02:36 PM   #4
Tinkster
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Quote:
Originally posted by baronlynx
but anyway the maximal transfers rates of usb2.0 is 480Mbps (~60MB/s) isn't it ? so it is >60times much faaaaster.
That would be the newest hi-speed addition to the
USB standard ... most current interfaces have either
1.5 or 12 MB/s ...


Cheers,
Tink


P.S.: I don't have a USB 2.0 interface on
any of my machines, so can't provide you
with benchmarks ;)
 
Old 01-19-2004, 03:44 PM   #5
AF1234
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I've had the same problem that you are having: transfer rates simply weren't up to specs
I have a hard drive external enclosure (generic, no name) that contains a relatively decent drive (Western Digital, 20 Gigs: ATA100) which is not the bottleneck in the setup.

The USB2.0 host controller was based on a VIA 6202 chipset and that's what caused the problem: transfer rates weren't even reaching 1.5 Mbytes per second, which is USB 1.1 maximum transfer rate. The host card simply wouldn't switch in high speed mode. The problem was also present in Windows.

I simply brought the controller back for a refund and went to buy another card based on a NEC chipset. Performance is now better, averaging 2.5 Mbytes per second, but it is far from the advertised numbers... I've read several mails and posts and must conclude that speeds between 2 and 10 Mbytes / second are the norm for USB 2.0 devices... Needless to say that it's far from the expected 60 Mbytes/second!

So, to make a long story short, just avoid the VIA 6202 chipset on a USB 2.0 card. Unfortunately, it is probably what you have on your motherboard if it came with USB 2.0 ports. You may be able to know this by using usbview or typing:
cat /proc/bus/usb/devices |less

Aside from that, I don't think there is anything else that you can do.

Good luck!
 
  


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