USB HD transfer rate very slow

[kliodd]

I have a USB 3.0 2TB powered HD connected to the PI. And it is slow, transfering to it takes ages. Typical speed is 350 to 400 KB/ps. When I transfer directly to the SD card it goes ok, 5MB/ps. And transfering from the SD to the USB HD it again goes into slow mode.

When connected to a laptop the HD performs, so the problem must be with the PI somehow.

Have been searching the forums for a solution, but all are fairly technical and involve Linux coding. And I only have the Raspbmc.

Clues from different forums include:
1. USB HD drains power from the PI although itself is powered
2. Must have a USB powered hub to connect the HD
3. Firmware bugs

All suggestions are welcome and greatly appreciated

[elatllat]

Code: Select all

dmesg
mount
df -h

[kliodd]

Code: Select all

dmesg
mount
df -h

How can i run this on my Pi with Raspbmc and what does it do?

[kliodd]

I still have this problem, have tried fitting a USB hub, this did not change anything.

Also, found another strange thing, I mounted a USB thumb drive, went into the file manager program. There I copied from the USB thumb drive to the USB HD, this went slow as always. But then I tried the other way, reading from the HD to the thumb drive, this went much faster, as one would expect in fact.

[ghans]

Perhaps reformating it to ext4 can help.
How does this show up in Windows ? As a NTFS drive ?
NTFS is cpu-intensive on the Pi platform.

ghans

[piglet]

NTFS is cpu-intensive on the Pi platform.

Aha! Thanks. I've got the same problem. Will try ext4.

[encryptix]

similar problem (& solution) to http://forum.stmlabs.com/showthread.php?tid=2819 ?

[ghans]

If you that with ext4 , you should easily get 6-7 mbps .
Did you try ntfs-3g instead of ntfs ?


ghans