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Re: [OM] CF card read speeds [was No E-System pro camera until 2010 ; (

Subject: Re: [OM] CF card read speeds [was No E-System pro camera until 2010 ; ( - Now xD vs CF]
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Thu, 15 Oct 2009 20:27:45 -0400
Even within the same technology (eg Ultra II) there is a performance 
penalty for going over 2GB.  Over 2GB you have to use FAT32 which has a 
lot more cluster management overhead than FAT16.  But your 4GB Extreme 
IIIs certainly perform well with the right hardware.  It would be 
interesting to know the real bottleneck in those tests that showed no 
improvement of ExIII over UII.  Probably dumb programmers.  :-)

Chuck Norcutt


Moose wrote:
> Chuck Norcutt wrote:
>> Then I clearly have a bottlneck(s) somewhere.  My USB 2.0 CF card reader 
>> only runs about 7-8 MB/sec while the expresscard hits 10-12.  Most of my CF 
>> cards are SanDisk Ultra II.  A few generations back.
>>   
> 
> Probably the reader/card combo, mostly reader. I did some testing of 
> read speeds, in MB/sec.:
> 
>                           2GB    4GB
> Reader                    UII   ExIII
> -------------------------------------
> Built-in in desktop       2.6   2.6
> Old All-In One            5.6   5.6
> NEW All-In One           10.0  20.4
> Super Power              10.3  10.8
> CF=>IDE=>USB              9.8  22.3
> 
> You can see that the bottleneck varies between reader and card. Looks 
> like your 10-12 for an Ultra II is card limited, as expected.
> 
> Moose
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