Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

Help! Pathetic USB performance on iMac G5

B

bigwig

macrumors 6502a
Original poster
Sep 15, 2005
679
0
I have an external USB hard drive (WD Elements 1.5TB) and an external DVD drive (LiteOn iHAS422-08 in a Vantec NST-530SU enclosure) hooked up to the USB ports on the back. I can't seem to get more than 5Mb/sec out of them. That's USB 1.1 level performance from these USB 2.0 devices, even though I have no USB 1.1 devices hooked up to the machine (other than the keyboard). Bluetooth is off. I've tried completely powering down but that didn't change anything. What could be the cause of this problem?

iMac G5 Rev B
2GHz PPC
2 GB RAM
OSX 10.5.8
 
spinnerlys

spinnerlys

Guest
Sep 7, 2008
14,328
7
forlod bygningen
USB 1.1 had a maximum transfer rate of 12Mbit/s, which would result in 1.5MB/s.

The older PPC Macs don't have very good USB drivers, so the slow speed is expected, but that slow is a bit harsh.

My iBook G4 could give me at least 10MB/s via USB 2.

Have you tried resetting the SMU or another USB port on that iMac?
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom