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95MB/s Sandisk Extreme Pro cards
  • 242 Replies sorted by
  • balazerbalazer

    Dirk, the card's maximum or average write speed is not necessarily what matters for the GH2 and spanning. Spanning probably has to do with how quickly the card does something, but what that something is is hard to define, and may even be a complicated thing like a specific series of things with specific timing. Without special tools to monitor the GH2's internals or the SD card bus, it's very hard to know what's really going on.

    I'm guessing that the GH2 spans to maintain compatibility with the AVCHD standard, independent of the file system's maximum file size.

  • rikyxxxrikyxxx

    @balazer

    I think I got it, thanks.

  • DirkVoorhoeveDirkVoorhoeve

    So if I understand correctly, the GH2's top limit is the High Speed mode, which is 25 MB/s (200mbps) (50 MHz x 4 bits bus)?

    @alcomposer @mee to be more specific: the little U with the 1 in it means it is UHS class 1, meaning that minimum write speed of the card is 10MB/s at the UHS bus-speed. The capital i (next to the SDXC logo) means that is supports ultra high bus speeds of 100 or 208 MHz, so that the maximum speed of the card might be higher then 25 MB/s.

    @balazer @rikyxxx Knowing that cards supporting ultra high bus speeds are only of use if the cards maximum speed is > 25 MB/s, hopefully these cards do have higher maximum write speeds, which also might mean that they have higher avarage speeds that are getting closer to the 25MB/s. Isn't it?

    Where can I find some more information on what happens when the camera is spanning? I understand that the problem is with writing blocks that are smaller then 64KB. Does it clear it's buffer first, before buffering the new file (hence writing two files for a short period) or am I way off?

    Also I was wondering, as the GH2 supports SDXC (extended capacity) out of the box, some users say the cards are formatted as exFat by the camera. Is this really true? Because if it is, I have two questions:

    • did anyone already have problems with the fact that it only uses one allocation table instead of two?
    • as exFat supports files bigger then 4 GB, why is the GH2 using spanning on those cards?
  • balazerbalazer

    @rikyxxx, to answer your question about the 95 MB/s UHS cards: why would there be any benefit to using a fast UHS card in the GH2 if the GH2 doesn't support UHS?

    It's kind of like asking if there is any difference between a Ferrari and a Toyota if you can only drive the speed limit. The car's top speed is just one performance metric, and not necessarily the one that makes any difference to a particular driving scenario.

    The GH2 supports HS mode, and all of the cards that we use in our GH2s support HS mode at the same bus speed. Even if the card's buses can operate at the same speeds, there are lots of internal performance differences between the cards, like how quickly they can finish a data write of a particular size and free the bus for the next write, or how quickly they can finish a series of data writes of some sizes. That seems to be the difference for why some cards can span with certain encoder settings and bit rates, and other cards cannot.

  • oscillianoscillian

    @mee :)

  • meemee

    @oscillian http://www.bhphotovideo.com/c/product/843343-REG/SanDisk_SDSDRH_064G_A11_64GB_SDXC_Memory_Card.html

    @alcomposer Oh I know, it's just I am seriously broke, literally have 13 yen to my name right now. That's YEN !!

  • oscillianoscillian

    @mee The BnH card is Class 10. The one in my picture is Class 6. So the verdict is still out... Genuine or fake?

  • alcomposeralcomposer

    64 95mb is not really that expensive when you take into account cost of camera ownership etc... And at the end of the day no matter what you do its a 'large' card... I really don't know how film makers are supposed to shoot 'RAW' with data rates exceeding 800Mb's. If I were shooting a feature (or anything really) that would add up easily to 5TB a day... whoa!

  • meemee

    @alcomposer I see, so it is. Bummer. Truthfully, I am holding out for the 64gb 95 MB/s cards price drop, but the 64gb 30 MB/s card is soooo tempting at that price. I will be broke for a few more months, so we will see what fate has in store when I can actually afford something for myself.

  • meemee

    @oscillian a bit late, but it is real http://www.bhphotovideo.com/c/product/844763-REG/SanDisk_SDSDU_064G_A11_64GB_SDXC_Memory_Card.html Also a very very tempting deal since the new Orion patch seems to span on my 8gb 30MB/s card.

  • alcomposeralcomposer

    @mee You see that little U with a 1 in it on the left of the card??? That is UHS-1 mark...

  • meemee

    The tiny speck of glimmer which resembles hope is the fact that they are not labeling it UHS-I. I heard others saying UHS-I was the problem, and during my return ordeal with Sandisk over my 16gb 45MB/s card they kept eluding to UHS-I being the issue or rather potentially incompatible with my camera to achieve maximum UHS-I write speeds. Perhaps they have simply ditched the label to sell overstock, or perhaps this is a great deal on a 64GB card with speed, and dare I say spanning?

    All that said if you buy it and need to return it, 3 months later they finally sent my new 95MB/s card out two days ago, despite receiving the old one 2 months ago. Not harping, just saying as much as I would like to see someone test the 64GB 45 MB/s card, it needs to be someone that can afford to deal with a lengthy return should it just be another lemon.

  • balazerbalazer

    Testing of the 32-GB 95 MB/s Extreme Pro card shows that it is faster than the old 30 MB/s HD video cards in the GH2. I found it to be more stable and span at higher bit rates in HBR mode.

    The 64-GB card is supposed to be even faster, but it suffers from the "file limit exceeded" error message.

  • alcomposeralcomposer

    @yeehaanow

    Ok... If you want 'any' sort of auto features with a setting, and spanning look at flowmotion with the 95mb. I have tested it and currently it's the only setting that spans with auto camera settings.

    Test it out! Otherwise you need to set everything to manual.

  • oscillianoscillian

    I can't find any info on Sandisk 64Gb Class 6 30MB/s as in the top right corner. Is it for real or just a mockup?

    9863240419.jpg
    546 x 546 - 50K
  • sohussohus

    @yeehaanow Patch problem, the bitrate is too high at point of spanning. I have done death chart torture tests and many patches survive with spanning while some others don't that regularly span in more static shots.

  • yeehaanowyeehaanow

    Just did 3 days of shooting with Sanity for 1.1. Shooting in HBR 30p with Lumix lens auto focus, sometimes full auto. On 64g 95mb/s had several recordings just stop for no apparent reason with no message. Sometimes it was during a quick zoom and right at the point it should've spanned. Weird.

  • duartixduartix

    Thanks everyone. So, the "Big" card is a good 30MBs sustained write. Impressive.

    @sohus : your benchmark values are unusually low. Either you need to do a full format or it's a virtualization issue. The speed curve on the last one is rather unconventional...

  • Mr_MooreMr_Moore

    @sohus I think you’ll get more accurate results if you use AJA System Test http://www.aja.com/products/software/ (it’s a free utility) and run it directly on Mac OS.

    Here are my results with two Transcend cards, a 4GB and a 16GB:

    Transcend 4GB.png
    594 x 648 - 98K
    Transcend 16GB.png
    594 x 648 - 100K
  • spacewigspacewig

    @duartix

    Completed benchmark of 64 GB Sandisk SDXC that just underwent a long format. Results below. I included all details from scroll screen on the right.

    Done on Windows 7 system (USB 3.0)

    Sandisk Benchmark 1.PNG
    642 x 491 - 54K
    Sandisk Benchmark 2.PNG
    383 x 251 - 12K
    Sandisk Benchmark 3.PNG
    384 x 251 - 12K
    Sandisk Benchmark 4.PNG
    383 x 252 - 13K
    Sandisk Benchmark 5.PNG
    381 x 249 - 12K
    Sandisk Benchmark 6.PNG
    378 x 251 - 12K
    Sandisk Benchmark 7.PNG
    382 x 247 - 11K
    Sandisk Benchmark 8.PNG
    381 x 250 - 11K
  • sohussohus

    Here is what I just benchmarked on my 3 different SD cards. I did the benchmarks in Parallels Desktop so not sure if it maximizes all bus speeds but the differences look realistic to me (especially write performance).

    Transcend 32GB Class 10.png
    656 x 506 - 55K
    Sandisk 8GB Extreme Video 30mbs.png
    667 x 496 - 55K
    Sandisk Extreme Pro 64GB UHS-1 95mbs.png
    653 x 504 - 56K
  • alcomposeralcomposer

    @duartix Don't have PC- (and rendering large project right now so no going into VPC either)..

    What I do have: USB3; Sandisk USB3 SDXC reader; 95MBs card; Blackmagic DiskSpeedTest

    Best WRITE: 76MB's Best READ: 79MB's

    (will probably get higher- its an iterative thing that software!)

  • duartixduartix

    Can one of you who own the Sandisk 95MBs please benchmark a recently fully formatted card with this:

    http://usbflashspeed.com/

    and publish your results here?

  • alcomposeralcomposer

    @chauncy All of the setting I have on my camera span on a 64gig 95mb card. This is huge. Spanning has always been an issue and this card whipped that away. As for higher quality- there was a time when I was running 24p very high indeed, that was before @Driftwood lowered the bitrate. What we will see is a better usage of the bits rather than more. This is what the next PTool will be about, making use of AVCHD, not treating it like raw... This is what will get us better - more gradable images- not more bitrate currently. YMMV

  • chauncychauncy

    My tests with the 95mbsec 64gb card all show one thing. I have yet to find a setting in 24p or 720 or anything that has any different recording abilities on 95msec card than the sandisk 30mbsec cards.

    If the setting will write error in 30mb/sec card it will write error in 95mb card. It may take 8 seconds instead of 3, but that's it.

    The only thing the 95mb/sec card gives is the ability of a few patches to span.

    Granted that's significant, but it's not like you can use higher bitrate patches just because you have the 95mbsec card.

    I had hoped for a little more...

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