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05-23-2011, 09:00 PM   #1
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Crap! My new class 10 sd card run much slower than my old class 4 sd card...

I was using a class 4 4gb sandisk sd card for my pentax kx until recently upgraded to a class 10 16gb PNY sd card. unfortunately it is not a upgrade in term of speed....
my kx now run much much slower....
write time after take a photo is about 2s now with the new card, but before is almost instant.
writing time after recording video is like 6s now, with the old card is like 1s
What happen. I am so upset...


Last edited by liukaitc; 05-23-2011 at 09:33 PM.
05-23-2011, 09:04 PM   #2
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QuoteOriginally posted by liukaitc Quote
What happen. I am so upset...
Class 10 on the sticker doesn't always mean class 10 on the inside if you bought it form ebay for example. Where did you buy this card? Was it cheap?
05-23-2011, 09:10 PM   #3
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bought on amazon.
Amazon.com: PNY Professional 16 GB Class 10 Hi-Speed SDHC 20MB/s 133x Flash Memory Card P-SDHC16G10-EF (Black): Electronics
05-23-2011, 09:16 PM   #4
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It's half the price of the SAN Disk equivalent, looks like only half the performance too. Read the reviews of that card and you'll find comments about very slow write speed.

05-23-2011, 09:20 PM   #5
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crap..but how come it lag so much than a class 4 sandisk card...
i got a defect card? or kx does not handle 16gb card well?
05-23-2011, 09:24 PM   #6
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kx handles 16gb fine, I use sandisk class 4 or 6 cards bought from B&M stores and they're plenty fast enough even for video. Maybe that manufacturer is very creative with their labelling.
05-23-2011, 09:32 PM   #7
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can I return to amazon got refund if I already throw away the product package?
05-24-2011, 05:09 AM   #8
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QuoteOriginally posted by liukaitc Quote
can I return to amazon got refund if I already throw away the product package?
I doubt it... One to chalk upto experience...

05-24-2011, 07:13 AM   #9
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but how u suppose to know the card is defect without open the package and use it.
I just tested my old old class 2 card. it is still much faster than this class 10 card. must be a defect...

Last edited by liukaitc; 05-24-2011 at 07:22 AM.
05-24-2011, 07:53 AM   #10
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QuoteOriginally posted by liukaitc Quote
but how u suppose to know the card is defect without open the package and use it.
I just tested my old old class 2 card. it is still much faster than this class 10 card. must be a defect...
Did you buy it with a credit card like Master Card or Visa? If so you are normally covered for an extra 30 days form the purchase date. I would contact Amazon first then if it falls through, contact your credit company.
05-24-2011, 09:03 AM   #11
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QuoteOriginally posted by ducdao Quote
Did you buy it with a credit card like Master Card or Visa? If so you are normally covered for an extra 30 days form the purchase date. I would contact Amazon first then if it falls through, contact your credit company.
Thanks, I just contacted amazon. They said yes I can return and got refund, just ship back in another safe pacakge
05-29-2011, 05:37 AM   #12
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When buying cards you still have to keep in mind that the class rating is only a minimum - at the time your class 4 card was made, that may have been the highest actual class rating they could give the card. In all likelihood if it were made today it would easily meet the class 10 rating, and be called a class 10 card. The reality is that even the Class 10 rating isn't necessarily super fast, as the OP has come to find out. If you're going for a different card, good luck!
05-30-2011, 09:14 PM   #13
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I had a 4gb Sandisk Ultra class 4 card. It also outperformed the PNY class 10 8gb card in my k7, by a fair margin. I returned that and bought a Lexar Pro class 10 8gb instead. The Lexar doesn't really outperform the Sandisk by any appreciable amount, but the price was good for the size and at least equal performance.

At this point, I'm convinced the only cards to consider for real speed, on a reliable basis, are the Sandisk Extremes.
05-31-2011, 06:00 AM   #14
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QuoteOriginally posted by gooberlx Quote
I had a 4gb Sandisk Ultra class 4 card. It also outperformed the PNY class 10 8gb card in my k7, by a fair margin. I returned that and bought a Lexar Pro class 10 8gb instead. The Lexar doesn't really outperform the Sandisk by any appreciable amount, but the price was good for the size and at least equal performance.

At this point, I'm convinced the only cards to consider for real speed, on a reliable basis, are the Sandisk Extremes.
That is probably not a bad assumption - the high end sandisk cards have always sort of been the go-to brand for top of the line cards. You do pay for that quality though! It is unfortunate they don't run great rebates like they used to (ones that made them as affordable as the average card prices).
05-31-2011, 11:56 AM   #15
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QuoteOriginally posted by pxpaulx Quote
That is probably not a bad assumption - the high end sandisk cards have always sort of been the go-to brand for top of the line cards. You do pay for that quality though! It is unfortunate they don't run great rebates like they used to (ones that made them as affordable as the average card prices).
Yeah it is unfortunate. They seem to be the best cards for speed (maybe occasionally edged out by some good batches by other rarer manufacturers...but not reliably), and I've read they take a beating better than most other brands.

But the price premium can be hard to swallow. C'est la vie.
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