[olug] slow microSD card file xfer

Aric Aasgaard aric at omahax.com
Tue Sep 29 12:40:51 CDT 2015

55 min to transfer 64GB is close to 20MB/s.  .....that is about normal for a typical cheap class 10 microSD card.

Your neighbor is probably not using a high end microSD card in a GoPro.

-----Original Message-----
From: olug-bounces at olug.org [mailto:olug-bounces at olug.org] On Behalf Of Obi-Wan
Sent: Monday, September 28, 2015 12:26 AM
To: Kevin D. Snodgrass <kdsnodgrass at yahoo.com>; Omaha Linux User Group <olug at olug.org>
Subject: Re: [olug] slow microSD card file xfer

The sdcard itself or the card reader are usually the limiting factors in transfer speeds.  Many cheap cards or card readers can't transfer any faster than what you experienced.  Cards usually publish their speeds, so you can look it up.  Readers usually don't.

There's a reason pro photographers shell out big bucks for high-end cards & card readers.  The last 32GB CF card I bought cost me over $100.

Ben "Obi-Wan" Hollingsworth, www.Jedi.com Sent from my Ting Samsung Galaxy Note® II

<div>-------- Original message --------</div><div>From: "Kevin D. Snodgrass" <kdsnodgrass at yahoo.com> </div><div>Date:2015/09/27  11:42 PM  (GMT-06:00) </div><div>To: OLUG <OLUG at olug.org> </div><div>Subject: [olug] slow microSD card file xfer </div><div> </div>Ubuntu 14.04LTS, HP computer, not sure what model (sorry), copying all files from a microSD card used in neighbor's GoPro.  64GB card took about 55 minutes to copy.  USB 2.0 theoretically can moved 60MB/sec, so that would take less than 17 minutes, figure 20-25 minutes for the non-theoretical real world file xfer.  This computer has a built in memory card reader, has 4 slots on the top face plate, all of course are USB attached.  Checked to see if EHCI driver was loaded for that port and it is.  Why so slow? Kevin D. Snodgrass _______________________________________________
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