Also want to chime in here. I replaced all of my Transcend gold cards (60MB/s Write) with the newer version of Sandisk Extreme 64GB (40MB/s Write). I'm running Cake on 3 GH2s and they all work flawlessly so far, after a number of paid gigs.

We're not talking about Transcend here. Read the context. Sandisk Extreme Pro is what we were talking about. All SanDisk Extreme cards work with the hacked GH2.

@hexagonal, the file number limit problem is in the FAQ: http://www.personal-view.com/faqs/gh2-hack/gh2-hack-faq

There was never any question that the U3 card would work in the GH2. UHS cards are all backwards compatible with HS mode. The only question is much more subtle, about the performance of the card for spanning with the highest bit rate hack settings, which only the 64 GB 95 MB/s SanDisk Extreme Pro cards seem to do.

@Manicd @balazer @matt_gh2

SO!

I said earlier that I ordered a U1 card because I wasn't sure whether U3 will work or not. Well, Amazon sent me a U3 card... It works! I haven't recorded much, but on a two run trial I got the stats below from MPC and 4'20" correspond to 4.12GB of storage. I am using moon T7... I noticed something, though. The framerate seems to be variable? sometimes is shows 23.97, then changes to 24, then 24.25 and so on as you can see on the screenshot. Haven't noticed this before.

On the card stuff, though... I guess we can assume that U3 labeled cards are actually the same as the U1 variants HW and FW wise, I imagine. I just put the card in, formatted in camera, started recording.

Quick question, @frame mentioned that there is a bug of sorts about "file limit number" or something like that with 64GB cards. What did he mean by that?

@Manicd

Thanks for the info. If I could be picky, the Amazon review was in 2012. However, the BH one is recent so I would guess that it should be fine. I'll get a U3 64GB one and see how it goes. Get back to you all when I get it.

@balazer

What is the "file number limit exceeded" issue? This is the first time I read about this. I decided to go for 64GB instead of 128GB because of the few repeated mentions that 128GB cards are too fragile to handle.

@matt_gh2

Thanks. Look forward to hearing from you on which one you had!

The GH2 doesn't support UHS mode, so of course the card is just going to work in HS mode, which has a signaling rate of 25 MB/s.

UHS Speed Class 3 was only created recently. My guess is that the SanDisk Extreme Pro 95 MB/s cards with a UHS Speed Class 3 rating are identical to the older cards with a UHS Speed Class 1 rating, and that only the label was changed. The older cards are certainly performing above the level of UHS Speed Class 3.

But the 64 GB one is the best performing one on the GH2, better than the 32 GB one. The 128 GB one could be different. Personally I use the 32 GB one because I don't want to deal with that "file number limit exceeded" issue of the 64 GB cards.

On addressing a previous post on another thread (link below) on whether U3 64GB Extreme Pro 95mb/s will work with the GH2 the same as the U1 64GB Extreme Pro 95mb/s which have been available for a while, I got an answer from SanDisk about the query and, if it would work, then at what speed. Sadly enough, they still did not really address the question.

The answer really leaves us nowhere except to be in touch with Panasonic. I guess I can try that tomorrow...

Original thread where I placed the question and a small discussion followed:

http://www.personal-view.com/talks/discussion/comment/196440#Comment_196440

Here is Sandisk's response:

"Dear ,

I understand that you would like to know if SanDisk Extreme Pro UHS-I Memory Card of 64GB is compatible with your Panasonic GH2 camera.

We have checked and found that your Panasonic camera is compatible with our card.

You were requested the speed specifications of the card, and as we discussed before this card is a UHS-I card. Seems that your camera is not recognizing the U1 speed as you mentioned and performance is lower than you expect we cannot guarantee you that the U3 speed will have a good performance on your camera. It may be work fine with your camera, but the highest speed is not guaranteed as requested.

The minimum speed that the card will perform is 10MB/s. You can see those specifications in the link below: Speed Ratings (performance) for SD/SDHC/SDXC cards

However, we would recommend contacting the manufacturer of your device for further information prior to proceeding with a purchase. Since from our side this card has been tested successfully and should be working normally with your camera and provide you a good speed performance.

For future reference, you can check SanDisk’s online Product Compatibility Tool; this application allows customers to verify if the SanDisk product that they intend on buying is indeed compatible with their device. The application also suggests all compatible products for a wide range of devices. That way you are always certain that the product you are about to purchase is compatible with your device.

We remain at your service for any additional information."

So, still no word on U3 compatbility.

B&H Sandisk 64GB 95 MB/s SD Card - $59

http://www.bhphotovideo.com/c/product/824149-REG/SanDisk_SDSDXPA_064G_A75_Extreme_Pro_64GB_SDHC_SDXC.html

Does anyone have experience with the new Sandisk Extreme 64GB (non-pro)?

http://www.amazon.com/gp/product/B00MBFPT3A/ref=gno_cart_title_0?ie=UTF8&psc=1&smid=ATVPDKIKX0DER

@Magic815 I tested the Transcend card with 60 MB/s Write and 95 MB/s read, and it didn't work consistently on the hack setting I was using, which was Canis Skin Tones Soft. All the tests came back with a bitrate of 147Mb/s. The camera was able to do one 4 minute recording. Then I setup a different shot, and repeatedly it would stop after 5 seconds with an error regarding the SD card's write speed. So it may work with some of the hack settings, but for anything ~147 Mb/s and up, I wouldn't trust it for anything serious. (I was in fully manual mode, using a non-Panasonic lens that had no electronic connection to the camera.) I've read reviews that it handles the 100Mb/s mode on the GH4 just fine, so the card's capacity must be somewhere between 100-147 Mb/s.

I'm going back to using the gold standard for GH2 - the Sandisk 64GB 95MB/s. The price just dropped to $91 at B&H and Adorama.

@club_irate

They work ok :-)

Awesome, I'd love to see your results. Good to know that the SDXC "file number limit" issue may not be that widespread. If I'm going to buy an SD, I'd prefer to go with the 64GB size. I just wanted to make sure it didn't still have known downsides to the SDHC 32GB version.