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Re: [OM] Western Digital My Passport Essential USB 2.0-Powered External

Subject: Re: [OM] Western Digital My Passport Essential USB 2.0-Powered External Drives
From: "C.H.Ling" <ch_photo@xxxxxxxxxxxxx>
Date: Tue, 3 Feb 2009 11:20:45 +0800
So when we are talking about external drives for backup, then writing time
is also very important, eSATA does not has that much advantage here.

C.H.Ling

----- Original Message ----- 
From: "Chuck Norcutt"

> AS I said the other day, disks spend a lot of time just trying to get to
> were they're going and, once they get there, waiting on the correct data
> to rotate around to where the head is.  They all seek to where they're
> going at very similar rates and, assuming the same RPM on the platters,
> they all wait at the same speed.  Actual data throughput gets dragged
> down by all the mechanical delays.
>
> But do be aware of what you're comparing.  If you are simply reading
> from the USB drive into memory but reading and writing between the two
> SATA drives then the write operation has the SATA drives at a big
> disadvantage.  Writing takes longer than reading and the reading from
> drive 1 can't go any faster then the writing to drive 2 once the cache
> is full.
>
> Chuck Norcutt
>
>
> C.H.Ling wrote:
>> 5x! Did you ever made a real comparison? I got 22MB per second for USB
>> and I
>> can't get over 30MB with SATA to SATA (two hard disks inside the same
>> PC). I
>> believe the HD sustain rate and other overheads in the computer limited
>> the
>> data rate a lot.
>>
>> C.H.Ling
>>
>> ----- Original Message ----- 
>> From: "Moose"
>>> I'm simply not buying any external HD which is USB 2.0 only. eSATA is
>>> WAY faster, 5x the speed, and only a very few $ more, if that. Maybe it
>>> shouldn't make a difference for a drive planned for backup use only, but
>>> it does for me. I simply find it easier when the process goes faster.
>>>
>>
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