Hi Markus
You are absolutely right, my drive is 2.5" and NOT 3.5" as I wrote; I
really should re-read my postings carefully before hitting the send
button :-(
Anyway, being a 2.5" drive, it does in fact require a 5V DC supply -
which can be USB-supplied.
I take on board your comments about higher initial power consumption,
but this drive has been used succesfully for over a year while
attached to a hacked and frequently re-booted Linksys NSLU-2 (which I
used as my original prototype platform), so I am somewhat surprised
that it would hiccup on my TS-7260.
Your suggestion that I should perhaps invest in a powered USB hub is a
good one - and may well be the route I need to follow - but perhaps
someone out there has an alternate suggestion which won't cost me
money ;-)
Cheers,
Philip
--- In Markus Peuhkuri <> wrote:
>
> 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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