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- USB-HDD enclosure with capacity limit?
- Werner R Schilling
July 25, 2007, 8:06 pm
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can be put in an USB enclosure? I have a Transcend StoreJet box
and would like to install a HDD of 160GB in that. In older
publications Transcend mentioned a limit of 120GB for that product.
This has disappeared, but a recent request for information from
Transcend was not answered.
Re: USB-HDD enclosure with capacity limit?
A USB port is supposed to be able to supply up to 500ma (half an amp,
2.5 watts). Some will supply more (actually in violation of the spec),
some less (not a spec violation, but undesirable).
Most 2.5" hard drives will run on 500ma, but not all of them. However,
I have never seen one that needed more than about 800ma. Keep in mind
that 2.5" drives are used in laptops, battery life and thermal (heat)
management depend in part on how much power the hard drive uses, and
driver makers compete with each other for laptop business, where lower
power is better; and now we have the USB market where the spec limit is
500ma per port. There is a STRONG market pressure on the driver makers
to keep power consumption to 2.5 watts (500ma).
Re: "he firmware in this processor might have arbitrary limits on the
amount of disk space it can handle"
There are some limits, but they are not arbitrary. Really, if it will
support more than 137GB (that's decimal GB ... about 127 binary GB),
it's likely to support pretty much anything, and certainly anything
currently in production in a 2.5" drive.