On 11/03/2011 11:41, Grahame Parish wrote:
In message<4D7A0763.4000303@xxxxxxxxxxxx> "David J. Ruck"<druck@xxxxxxxxxxxx> wrote:On 11/03/2011 11:09, Grahame Parish wrote:Last night I attached a self-powered native formatted external hard drive to a USB port and it froze the machine - this is not usually a problem.It may well have been. Self powered drives can draw too much current from the Iyonix's USB ports.Probably not the best term to use - by self-powered I mean that it has its own power, not dependent on USB power.
Sorry, miss interpreted that.However, some badly designed devices can still attempt to power themselves from the USB port if their external power supply isn't on. So you have to take care to always turn the PSU on before connecting the USB.
At work we had 16 USB smart card readers connected via 2 10 port hubs, all working correctly for some time, then I noticed someone had unplugged the mains cable powering both hubs, so both the hubs and readers were getting all the juice from the PC's USB port. Luckily we only use one reader at a time, so it didn't blow anything.
Cheers ---David -- Email: druck@xxxxxxxxxxxx Phone: +44-(0)7974 108301 ---To alter your preferences or leave the group, visit //www.freelists.org/list/iyonix-support
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