what is biggest USB-powered pocket disk?

[Anne Onime]

From what I see in shops, I gather that 500 GB is the
current limit. I presume above that an extra platter must
be added, or a bigger diameter used and then it will be too
much for a motor on a diet of 500 mA.

 

[Rod Speed]

From what I see in shops, I gather that 500 GB is the current limit.

Nope, there are already some bigger than that.

I presume above that an extra platter must be added, or a bigger diameter used

Nope, just put more on the current platters, as always.

and then it will be too much for a motor on a diet of 500 mA.

Not if the capacity of the platter is increased.

 

[iws]

From what I see in shops, I gather that 500 GB is the
current limit. I presume above that an extra platter must
be added, or a bigger diameter used and then it will be too
much for a motor on a diet of 500 mA.

I have a 640 GB Western Digital pocket drive. I suspect that's not the
largest.

 

[Yousuf Khan]

From what I see in shops, I gather that 500 GB is the
current limit. I presume above that an extra platter must
be added, or a bigger diameter used and then it will be too
much for a motor on a diet of 500 mA.

It's the same as whatever the biggest 2.5" internal laptop drives that
you can buy today.

Yousuf Khan

 

[Man-wai Chang]

From what I see in shops, I gather that 500 GB is the
current limit. I presume above that an extra platter must
be added, or a bigger diameter used and then it will be too
much for a motor on a diet of 500 mA.

Check out Hitachi Neso series. BTW, there is a toy called *powered* USB hub!

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[Arno]

From what I see in shops, I gather that 500 GB is the
current limit. I presume above that an extra platter must
be added, or a bigger diameter used and then it will be too
much for a motor on a diet of 500 mA.

500mA is not really the limit. The limit is the spin-up
current (up to 1A in some 2.5" notebook drives) and how the
port reacts if that is drawn. Many mainboards I have seen
(from Asus and Gigabyte) have an 1.6A resettable fuse on
each USB port _pair_. Some notebooks have "high-current"
ports that can deliver 1A or more for external disk to
spin-up reliably.

If the port does not deliver the spin-up current, the disk
will abort and spin-down immediately. AFAIK, except for SSDs
and USB FLASH, there are no current external USB-powered
drives that can work with a 500mA hard current limit.

Arno