Problem with an external usb HD - slow usb

[Luigi Castro Cardeles]

Hi list,

I use fedora 12 on a dell inspiron 1545 laptop.
(2.6.31.12-174.2.22.fc12.x86_64).
i have a external usb hd and i can't make it connect like a usb 2.0 device.
this device is ntfs format

I check if the device is using ehci (dmesg after i plug the device)
[root at localhost ~]# dmesg | grep USB
usb 2-2: new high speed USB device using ehci_hcd and address 2

I check if this device is connected on a usb 2.0
[root at localhost ~]# lsusb
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 015: ID 0471:2021 Philips
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I mount the device with this options:
/dev/sdc1 on /media/hd_backup type fuseblk
(rw,nosuid,nodev,allow_other,blksize=4096)

but when i use cp, mv or rsync, the max speed i get is max 6MB/s (a lot
800kB/s).
If i use this device on Windows (tested with Vista and Seven), i get much
high transfer rate.
I read about sync and async options, but if i put sync or async on fstab, it
does not alter the transfer rate.

Is this the normal upload transfer rate? I am doing something wrong?

[]'s
Luigi Castro Cardeles
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