@inqb8tr It was 1080i50... It was a single file and the file was about 2.5GB. So the recording stopped even before reaching the spanning point...

@driftwood Appreciate all the hard work Nick. I'll try to test Cluster X settings for spanning at the weekend. Well, no promises that I'll manage to go through all but I'll give it a go. If only I had more time too...! ;-)

@driftwood For spanning tests do you prefer a certain lens or does it matter? Also, autofocus going or anything active? 14-140 all auto to push it to it's limits?

@driftwood. Roger that. I have two shoots this weekend so I'll put some stuff through the ringers.

@MirrorMan That's some good looking footage. Really liked the 1st 2 shots - very cinematic.

Always record a little file after a long span set BEFORE switching off camera/attempting playback on 64gb cards.

Look back a few pages. Moon 24p spanned for me in 7 or so 4gb files on the same card as yours. What was your avg datarate @peternap ?

Quite a lot of confusion over the spanning/stability issue even with 95mb/sec cards when i went trough this thread.

To stir up a usefull discussion and provide a theory as to why we have people with failed spans i came up with the following: (let me know if this should be a seperate thread).

Let's for a second assume everyone has sandisk 95mb/sec cards (most even the 64GB one) we still see very different results on people who can span with almost identical setups. I just tested my SD cards in the internal card reader in my mac mini (which is connected over sata, and thus does not have usb limitations) and it shows very different results with the 3 cards i have.. i have 3 95mb/sec cards, 1x 32GB and 2x 64GB, when i use the blackmagic disk speed test (good ref. app) the 32GB reaches cont. 61mb/sec write speed, one of the 64GB reaches a cont. 36mb/sec write speed, and the other 64GB reaches 43mb/sec cont. write speed (tested this with 1GB,2GB and 4GB file writing, results are almost identical, formatted clean before testing, also tested under windows with atto disk speed test and results were same in range.. like max. 2 to 3mb/sec off).

What we see is large differences in actual cont. writing speeds of the cards 32GB: 61mb/sec 64GB1: 36mb/sec 64GB2: 43mb/sec

All seem fast enough to handle the GH2 data rate in cont' mode, but they usually take some ms to get up to full speed, in this moment it is probably where we can differentiate the good cards from the better cards and where the really high bitrate settings may sometimes fail.

As i was surprised about the large difference in cont. write speeds with the cards i contacted sandisk support and after validating all my cards were real sandisk cards they could not mention anything more usefull that the differences are within normal range for variety in writing performance between the same series of cards.

I will do some spanning tests with all 3 cards and see if i can find any relation from the cont. write speed to the fail/success rate of spanning. (bodysettings, patch, lens identical to keep it consistent)

Could some of you out there use the blackmagic or atto app and test your cont' write speeds of 95mb/sec marketed sandisk cards, maybe then we could get a general idea of how varied the actual performance of these identically marketed cards are.

Funny fact, when i take some of the older sandisk extreme 30mb/sec or 45mb/sec cards i have for my NEX camera, they are stuck between around 10 to 20mb/sec cont. average, the 95mb/sec cards are def way better quality overall!

@kritzresn very interesting results. thanks for sharing. did you do a low-level format of the cards with the SD Formatter just before testing? —https://www.sdcard.org/downloads/formatter_3/

If not, that might explain, I'm not sure if in part or completely, the discrepancies in your results.

Hi, I have a SanDisk 16gb Extreme Pro 95MB/s. I use Moon hack, the quality is amazing but I have some speed write error when i use the HBR mode and no error in 24p. why is the mode with the lower bitrate that make me some trouble ???

I made some test with codec chart and I confirm what I said two posts before: with moon, I have no problem in 24p (bitrate 148000Kbits) but I have a lot of write speed error in HBR or 1080i with a lower bitrate. I used sandisk 95MB and 45MB/s, same issue. I format my SD with SDFormatter. I don't understand what happening.

@orgie18 the clip of the sun with the birds flying across was awesome and so was the slow mo inline clip across the sky. twixtor im guessing? it was so good it almost looks fake lol