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View Full Version : [ubuntu] Data transfer speed 60 internal, 12 thru' USB port???



Moozillaaa
June 10th, 2010, 10:04 PM
Does this sound correct?

By 'internal', I mean from SATA channel x to SATA channel y.

Through an external enclosure, IDE drive, any USB port, to any internal SATA drive, transfer speed is 1/5th as fast.

Sometimes my boot hangs at 'loading hardware drivers'.

Do I have driver conflict? Where should I look?

jml
June 10th, 2010, 10:11 PM
Generally internal transfer rates are faster than "external" By the way, are you using USB 1.0 or 2.0? 1.0 only has a transfer rate of 12 Mbits per second versus 480 Mbits per second for USB 2.0.

Joe

Moozillaaa
June 10th, 2010, 10:47 PM
It's 2.0.

Would driver errors make it default to 1.0 speed? How could I find out?

Joe of loath
June 10th, 2010, 11:03 PM
The maximum transfer rate I've ever got from USB 2.0 is 22Mb/s. USB 1.0 something closer to 800Kb/s. However, what you're transferring to/from makes a difference. From my experience on my PC, a cheap USB stick is 3Mb/s write, An expensive one 6Mb/s, a cheap SD card 4Mb/s and a USB hard drive 22Mb/s.

Moozillaaa
July 3rd, 2010, 04:53 AM
I'm going from a USB enclosure with an IDE drive - WD 250G drive, to an internal SATA drive.

nmaster
July 3rd, 2010, 05:25 AM
from http://ubuntuforums.org/newreply.php?do=newreply&p=9541014:

I see the same thing as the OP, with respect to USB transfer speed.

What hardware do you have?

My USB Xfer rate is 12mb/s, with internal speed around 60mb/s.

Post here (http://ubuntuforums.org/showthread.php?p=9541000#post9541000) if you have ideas please...

well to be honest 30MB/s is more of a peak value. usually its in the mid to high 20s. i'm not completely sure what you problem could be, but it might be the filesystem(s). i have ntfs on my external and ext4 on my internal drive. i noticed better (faster) performance when i reformatted my internal drive to ext4 (from ext3).

also, have you tried actually benchmarking it? perhaps with iozone or fio (both in the repos). it might just be that the gui is displaying the wrong numbers.