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Re: [OM] OT - Card reader question

Subject: Re: [OM] OT - Card reader question
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Fri, 06 Jul 2012 21:29:38 -0400
Be careful the way you interpret specs.  480Mbps happens to be the spec 
for USB 2.0.  Actual max throughput in practice is more like 30MB per 
second.  But Apple says later Macs use the PCI Express bus to talk to SD 
cards.  That's faster but I don't know how much or what other traffic 
might be on the bus when you're trying to read the card.  They're 
non-committal.  They just say it's faster than USB but now how much. 
But it should be substantial and probably faster than any currently 
available SD card. See: <http://support.apple.com/kb/HT3553#4>

Chuck Norcutt

On 7/6/2012 8:18 PM, Michael Wong wrote:
> Bill,
> According to support document from Apple, the reading & writing speed of SD
> slot of Macbook Pro is 480Mbps, that menas approximate 60MB/s R&W speed.
> You don't need a new card reader :-)
> http://support.apple.com/kb/HT3553#4
>
> That means we have to purchase maximum 60MB/s speed SD card (400X).
>
>
> ---
> Michael
>
>
>
>
>
>
>
> On 7 July 2012 02:39, <NSURIT@xxxxxxx> wrote:
>
>> I am using a USB 2.0 Multi-card reader with cards that generally are 300X
>> or 400X speed.  Things are really slow on my PC.  Might I need a new  card
>> reader?  If so, what should I look for?  Yes, I do have a new  MacBook Pro
>> and the transition is not occurring at warp speed.  What card  reader
>> might be
>> best for the Mac?  Bill Barber
>> --
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