Hi,
First of all – I´m really grateful that you guys are interested in this issue and investing some time for troubleshooting. Thank you very much! I wonder if ML developers (A1ex or anybody else) are aware of this problem? Anybody cares to escalate?
To
chris_overseas:
Do you always start with a freshly cleaned/formatted card before testing this? – I tested many scenarios like 1) recorded 3 times on a row to the 128GB card (3 x ~ 8 minutes) while stopped each time right after write speed went down and started again in a few seconds or minutes, 2) manually deleted recorded data via 5DmkIII or PC/Mac and recorded again 3) formatted card in exFAT system and recorded again. Seems like this doesn´t play any role in here.
For me it also doesn´t seem like the actual frame drop although the recording speed is really low (~0,2MB/sec that slowly grows up to 45MB/sec). Although I haven´t actually analyzed recorded data in computer to be 100% sure. During testing I usually record so that camera is basically on the table or on tripod and films some static scene (wall, kitchen, out from the window etc.). So I´m not completely sure. Markus, have you confirmed that frames actually are not dropping or any artifacts doesn't appear on frames (that happened with my last Komputerbay 128GB 1000x cards – ugly horizontal violet/white stripes on some random frames).
Does the recording duration change if you change the amount of memory available (eg by enabling/disabling additional modules)? - If you mean features under Globaldraw then- NO. Time doesn´t change if the speed is decent from the very beginning and exceeds the required limit (83MB/sec, 92,5MB/sec and etc.)
Another problem could be the camera heating up however given the consistency of the above numbers that seems a little unlikely. It should also be pretty easy to test for – one of the latest ML firmwares (I use 15th of November 2013 version) has a temperature sensor that shows the temperature all the time. Haven´t seen that never raising over ~75c. So that should´t be an issue.
Just wanted to add that today when I tried to make external speed test with the card by using PC and Mac I managed to corrupt this last card also. First I tried a PC (notebook) but it only has USB 2.0 so this isn´t capable to show over 30MB/sec. I used CrystalDiskMark. Then I plugged the Transcend RDF8 UDMA7 CF card reader to iMac USB 3.0 and ran the Blackmagic disk speed test that showed nice numbers (up to 104MB/sec) but hanged at some point of time after running around 5 minutes or so and also corrupted the card. Same thing happened also with one of my last 128GB 1000x Komputerbay cards (that is now sent back to KB and once again I´m waiting for up to 4 weeks for replacement to arrive from US to Estonia) and I decided not to try the same combo again – Transcend RDF8 + KB 128GB 1000x CF + Blackmagic disk speed test.
So, right now I´m not able to test anything until replacements arrive again. Like I said KB refuses to refund the money saying that 28 days have passed and that was the time for monetary refund. Which is ridiculous cause most of the time the cards are being shipped and not used/tested. Due to that I´m unfortunately unable to recommend to anybody making business with KB company.
BTW - anybody knows how to fix corrupted CF cards? I´m not able to format it nor write anything onto it. The file folders are still present on the card, fortunately empty cause I managed to save the data before the corruption happened. Same thing in 5DmkIII, PC and Mac. Exactly the same type of corruption that happened with couple of previous KB 128GB 1000x cards I had. Didn´t find any helpful information in the internet cause most of the softwares are made to save the corrupted data but not the card itself. Any help would be much appreciated.
