Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-14-2011, 01:42 PM   #1
Loyal Site Supporter
bwDraco's Avatar

Join Date: Jul 2010
Location: New York
Photos: Albums
Posts: 1,007
PNY Class 10 card inconsistent write speed

I've just acquired a PNY Professional 16GB Class 10 SDHC card, and I've been getting inconsistent write speeds with this card. Sometimes, it would write as fast as it should, while it would occasionally take twice as long to write the same amount of data. I've zeroed the card and reformatted it numerous times. Formatting the card in the camera seemed to yield the slowest result, but formatting it on a computer with 4K clusters seemed to bring the best performance. Formatting it to 32K clusters was no better than formatting it in camera. I'm suspecting a 4K or other sector alignment issue. Is there anything I can do about this?

Edit: I've noticed that the camera formats the card to a 4MB partition alignment, 32K clusters, based on viewing with a hex editor and information from Windows.

--DragonLord


Last edited by bwDraco; 07-14-2011 at 02:21 PM.
07-14-2011, 02:26 PM   #2
Veteran Member
agsy's Avatar

Join Date: Aug 2010
Location: Florida
Photos: Gallery | Albums
Posts: 545
QuoteOriginally posted by DragonLord Quote
I've just acquired a PNY Professional 16GB Class 10 SDHC card, and I've been getting inconsistent write speeds with this card. Sometimes, it would write as fast as it should, while it would occasionally take twice as long to write the same amount of data.

Is that the PNY P-SDHC16G10-A? I have two of those and when I do some testing, at first the speed is pretty fast but then it slows down to class 6 speed. I am not sure why, however it made a big difference with HD movie recordings on my K-x (vs class 4 that I had before).

QuoteOriginally posted by DragonLord Quote
Is there anything I can do about this?
Could yours be defective? If you can, you should try to exchange it.



QuoteOriginally posted by DragonLord Quote
Formatting the card in the camera seemed to yield the slowest result
I always thought that the best way to format the SD cards for camera use is with the camera. Hope it helps.
07-14-2011, 02:44 PM   #3
Loyal Site Supporter
bwDraco's Avatar

Join Date: Jul 2010
Location: New York
Photos: Albums
Posts: 1,007
Original Poster
I can't exchange this card at this time. I'll try to fully zero the card once more and determine its performance. I'm suspecting garbage collection on the card. A test on the card finds no bad sectors.

--DragonLord
07-14-2011, 03:15 PM   #4
Loyal Site Supporter
bwDraco's Avatar

Join Date: Jul 2010
Location: New York
Photos: Albums
Posts: 1,007
Original Poster
After fully zeroing the card, write speeds are still inconsistent. I'll use it for some more time and try to determine if the camera's handling of the card or the card itself is to blame.

Edit: The card was writing in bursts, pausing for about half a second at regular intervals, while I copied files from the computer to the PNY card. An 8GB Kingston Class 4 card did not display this behavior. The card's built-in controller could be to blame, and it may be attempting to make it appear that it is writing faster than it is actually capable of. Anyone else noticing this behavior?

--DragonLord


Last edited by bwDraco; 07-14-2011 at 03:20 PM.
07-14-2011, 03:19 PM   #5
Veteran Member
agsy's Avatar

Join Date: Aug 2010
Location: Florida
Photos: Gallery | Albums
Posts: 545
Do you have any other cards? If so, you could compare the performance and rule out the camera as a problem. What are you using to test the speed?
07-14-2011, 03:28 PM   #6
Loyal Site Supporter
bwDraco's Avatar

Join Date: Jul 2010
Location: New York
Photos: Albums
Posts: 1,007
Original Poster
The PNY card was inserted into an SD card slot on my computer and was tested against a Kingston 8GB Class 4 SDHC card, which always wrote consistently fast and never displayed any problems. Both cards were tested in a PENTAX K-r shooting single and continuous RAW images, and the red card access light was lit for inconsistent amounts of time with the PNY card. The Kingston card always wrote at a constant speed.

QuoteOriginally posted by agsy Quote
at first the speed is pretty fast but then it slows down to class 6 speed.
Are the cards writing in bursts when you copy data from your computer onto the card? I'm trying to determine if your cards behave in the same way.

--DragonLord

Last edited by bwDraco; 07-14-2011 at 03:36 PM.
07-14-2011, 03:53 PM   #7
Veteran Member
agsy's Avatar

Join Date: Aug 2010
Location: Florida
Photos: Gallery | Albums
Posts: 545
I use HD tune to check my card's performance. My PNY starts up with 20 mb/s and after 15 seconds it drops to 16.5 mb/s. Actually I said it wrong, it drops to class4 performance. The weird thing is that my SanDisk Ultra II card is marked class4 claiming 15 MB/s transfer speed but HD tune shows 20mb/s consistent transfer speed, which is better than my PNY class10. According to this website, the minimum speed is what matters, which for a class 10 SD card is 10MB/s.
07-14-2011, 04:11 PM   #8
Loyal Site Supporter
bwDraco's Avatar

Join Date: Jul 2010
Location: New York
Photos: Albums
Posts: 1,007
Original Poster
ATTO Disk Benchmark yielded speeds of 18 MB/s, faster than my Kingston Class 4 card (10 MB/s), so I'm puzzled by this behavior. I need my equipment to work properly, since I'm going on vacation soon.

--DragonLord

07-14-2011, 04:27 PM   #9
Veteran Member
agsy's Avatar

Join Date: Aug 2010
Location: Florida
Photos: Gallery | Albums
Posts: 545
I downloaded your software and I get the same results, 18mb/s consistent...I'm not sure why would you get inconsistent performance unless your card is defective. I would test it on your camera in continuous shooting with RAW and maybe even HD video recording. Hope it helps. Maybe someone else who experienced trouble with PNY can relate to your issue.
07-14-2011, 04:51 PM   #10
Loyal Site Supporter
bwDraco's Avatar

Join Date: Jul 2010
Location: New York
Photos: Albums
Posts: 1,007
Original Poster
In both RAW and JPEG, whether in single shot or continuous drive, write times are inconsistent; the card tends to write at either a slower speed or a faster speed. I have not observed an intermediate speed. In movie mode, speeds are still inconsistent, but lean towards the faster speed.

--DragonLord

Last edited by bwDraco; 07-14-2011 at 05:05 PM.
07-14-2011, 06:19 PM   #11
Veteran Member
Docrwm's Avatar

Join Date: Sep 2010
Location: Somewhere in the Southern US
Photos: Gallery | Albums
Posts: 11,275
I've had nothing but trouble with PNY flash memory whether its in a USB drive or an SD card and so I have stopped buying their products. Sorry you're having these problems - my Transcend, Kingston, and SanDisk cards seem to be consistent in their performance and the Transcend and SanDisk Class 10s seem to be all they claim to be in terms of write speed.
07-14-2011, 06:37 PM   #12
Loyal Site Supporter
bwDraco's Avatar

Join Date: Jul 2010
Location: New York
Photos: Albums
Posts: 1,007
Original Poster
QuoteOriginally posted by Docrwm Quote
I've had nothing but trouble with PNY flash memory whether its in a USB drive or an SD card and so I have stopped buying their products. Sorry you're having these problems - my Transcend, Kingston, and SanDisk cards seem to be consistent in their performance and the Transcend and SanDisk Class 10s seem to be all they claim to be in terms of write speed.
I've never had issues with an 8GB PNY flash drive, which I've used for several years. I will test the card in another camera to isolate the problem.

--DragonLord
07-14-2011, 06:39 PM   #13
Veteran Member
Docrwm's Avatar

Join Date: Sep 2010
Location: Somewhere in the Southern US
Photos: Gallery | Albums
Posts: 11,275
QuoteOriginally posted by DragonLord Quote
I've never had issues with an 8GB PNY flash drive, which I've used for several years. I will test the card in another camera to isolate the problem.

--DragonLord
Always slower than rated in my experience, odd patterns to their speed, nothing but trouble from PNY so I stay away. Glad your 8gb Flash drive works fine for you.
07-14-2011, 06:44 PM   #14
Loyal Site Supporter
bwDraco's Avatar

Join Date: Jul 2010
Location: New York
Photos: Albums
Posts: 1,007
Original Poster
I did notice the inconsistency in another camera, a Fujifilm FinePix S1800, but to a lesser degree since this camera writes slower. I will seek a replacement after vacation.

Edit: A high-speed burst shooting test on the S1800 was mostly consistent, and the average speed was significantly faster than the Kingston card. I'm not sure what's happening, but I'll continue to use the PNY card for now. The PENTAX K-r could be at fault; if so, I hope a firmware update will fix it.

Edit 2: I've decided to stop using the PNY card and fall back to the Kingston 8GB card, which has never posed any problems. I'll return the PNY card and purchase a SanDisk Extreme 16GB Class 10 SDHC card when I get a chance.

--DragonLord

Last edited by bwDraco; 07-15-2011 at 09:04 AM.
07-18-2011, 01:36 PM   #15
Loyal Site Supporter
bwDraco's Avatar

Join Date: Jul 2010
Location: New York
Photos: Albums
Posts: 1,007
Original Poster
The PNY card has been returned and replaced with a SanDisk Extreme 30MB/s 16GB SDHC card. The SanDisk card proved to be far faster; the buffer cleared in half the time it took for the Kingston Class 4 card under a variety of conditions. Furthermore, copying speeds from the computer to the card were consistent, without any pausing or hesitation in the writing process. In the future, I will only choose from SanDisk, Lexar, and Kingston. I do not want unreliable or inconsistent performance.

--DragonLord
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
4k, alignment, camera, card, class, class 10 card, clusters, pentax help, pny
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Crap! My new class 10 sd card run much slower than my old class 4 sd card... liukaitc Pentax Camera and Field Accessories 15 05-31-2011 01:39 PM
PNY C10 card issue with Kx tenthumbs Troubleshooting and Beginner Help 8 05-20-2011 08:23 PM
k-5 write speed qh187 Pentax K-5 9 03-29-2011 07:00 PM
Will Class 10 memory card help with preview speed (K-7)? skyredoubt Pentax DSLR Discussion 3 10-18-2010 07:14 PM
For Sale - Sold: FS: PNY 4GB class 4 SD card $20-shipped Tdo0003 Sold Items 3 04-25-2008 09:53 AM



All times are GMT -7. The time now is 02:51 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top