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04-26-2012, 08:22 PM   #1
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Mushkin 32gb Class 10 mknsdhcc10-32gb Slow write times

Recently purchased the above memory card. Up until now I posessed the following cards: 16gb Class 6 Transcend, 8gb Class 4 Kingston, 2gb Transcend 150x (no class listed). In a test of write speeds I consistently timed the following using Manual Mode, Continuous shooting of 15 frames, (the most frames possible before slowing down due to buffer), 1/640, f4.0, Manual focus, camera not moved and shooting with artificial lighting. The camera has the latest version,1.04, and fresh battery. Each card was tested 5 times and each test was performed with a freshly formatted card. Timing till buffer was empty is as follows:
  1. 2gb Transcend 150x took 35 seconds
  2. 8gb Class 4 Kingston took 40 seconds
  3. 8gb Class 6 Transcend card took 35 seconds
  4. 32gb Class 10 Mushkin took 65 seconds
I was expecting better results from the Mushkin due to the claimed class. Has anyone else experienced slow write times with Mushkin? What is the fastest card to pair with the K-20D? Are there any sites with test data?
Thanks for reading and replying.

04-26-2012, 08:56 PM   #2
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Maybe the slowness is being caused by the fact that the card is so big? Or, because class 10 cards are rated for 10Mb/sec non-fragmented write speeds, whereas class 6 are rated for 6Mb/sec fragmented write speeds. So, if you format all your cards and try the text again, you should see the 32Gb card do better.

Many high-end cards are much faster than class 10- for example, that Transcend card will do about 30Mb/s.

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04-27-2012, 03:49 AM   #3
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QuoteOriginally posted by Adam Quote
Many high-end cards are much faster than class 10- for example, that Transcend card will do about 30Mb/s.
Transcend uses the 150x rating and that's a more accurate rating.
133x = 20 MB/s
150x = 22.5 MB/s
200x = 30 MB/s

So it could do 27MB/s but probably not 30MB/s because it would have been labelled 200x then.

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