tyerslockandblock wrote:
> I have a USB-powered 3.5" disk drive which I wish to use during
> application development. This device requires a 5V power supply, which
Are you sure that it is 3.5" and needs only 5V? AFAIK, all 3.5" drives
need both 5V and 12V and draw more current than USB can supply. Even if
your drive would have 100% efficient 5V to 12 V converter, your USB port
should supply on average about 2 A of current (10W) (USB max is 0,5 A)
and at startup a drive can take three or four times of that.
However, an 2.5" drive is just in USB specs on average (like 2.2 W) and
needs only 5V, but you may have problems at startup, as even a slow
drive can take more than 1.1 A at start.
For example, I have problems with my laptop (Dell D600) and 2.5" USB
drive. I need to use USB hub with external power or then PC Card with
USB connectors to supply enough current to get it running. There is a
windows patch by Dell to fix it, it just causes windows to ignore
overcurrent condition -- could patch Linux to do the same, but I'll
prefer data integrity :-).
Try with USB hub with power input.
t. Markus
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