[Novalug] Backup Device
Bryan J. Smith
b.j.smith at ieee.org
Mon Jan 4 23:28:34 EST 2010
Virtually all external 3.5" drives are +12V @ 2A (or under 2A, so 2A is sufficient).
The spindles are always powered by +12V, and lower potential can be transformed
from that. Vendors who vary from this deserve what they get.
Virtually all external 2.5" are powered by USB, with newer designs (assuming you
are not buying aftermarket) being fully powered by the 500mA of only one (1) port.
Mini-B connectors are slowing being replaced by Micro-B, the latter having a much
longer lifespan of connects/disconnects.
Even my 3-platter (12mm high, instead of 2-platter, 9.5mm) 2.5" Western Digital
Passport SE 1TiB 2.5" drive uses a single USB connector (Micro-B). The performance
of the drive easily exceeds sustained USB 2.0 block transfer rates. I'm skeptical on
what USB 3.0 will deliver (long story, unless USB's operation is radically changed).
I only use 2.5" because 3.5" was never built for portability or off-line periods, period.
----- Original Message ----
From: James Ewing Cottrell 3rd <JECottrell3 at Comcast.NET>
You know, with all the Standards we have, someone should standardize
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