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If you have a USB 3.0 and the cards you say are unusable on dslrs, what exactly do you mean? that when you insert them the camera would say card not formated? or are you saying you can't install magic lantern?

on the mkIII it works to record raw video but ML has to be on the SD card not CF, but raw video should be set to record to CF.

please explain by un usable?

Hi,

unusable = the DSLRs displaying "Card1 cannot be accessed - reinsert\change card"

and when i tried to format the card from camera i got the same message. the DSLR see a card is inserted but can't read or even format it.
the card was formatted in the PC to exfat, i even tried fat32 i tried every params to no avail before returning it.

on the desktop using a lexar usb3.0 the card was fine. (lexar dual slot USB3.0) 90MB/s WRITE and 120MB/s READ
i was able to format it on the PC via the reader multiple time with various block size but it remains inaccessible to the DSLR
while a lexar 64GB 800x card was perfectly visible and usable for all DSLR operations.

So i'm not even speaking of magic lantern as i'm running it from an eye-fi SD card on the mark III and it is running just fine.
it is just  about the usability of the card as a storage device on the DSLR let alone using it as a ML main storage device..

I returned the card today anyway.. i certainly got a bad controller or something but i can't afford the hassle of testing / returning card while Komputerbay can certainly hire an intern for that and label some card for Magic Lantern users .. like VPG-20 but ML-90 ;-)

Hi,

this is my first post but i'm following the forum since a year or so, i'm more of a hobbyist photographer.

despite bad feedback on the forum about Komputerbay card speed and or reliability, i purchased one 128GB 1050x for testing.
Unfortunately, it turned out that the card was unreadable by both my DSLRs (Canon 5D markIII and markII).
it was only readable on an Lexar dual slot usb3.0 reader on my windows7 Desktop.
the speed was about 90MB WRITE / 120MB/s READ but unusable on the DSLRs

I suspect that the controller was faulty and worked only in CF ATA mode versus Direct IDE mode.

So i wasn't able to perform any testing and will stop trying to work with this brand.

I'm very disappointed, the saving isn't worth the risk to get a defective card and potentially have to deal with all the return hassle..

And in my specific case with the symptoms i had i could have concluded that my brand new 5D3 has some bent pins on the CF slot but fortunately i had an old lexar 800x card that worked perfectly.

I understand that Komputerbay is trying to make the support better but you can't rely on your customers to make the basic QC or QA for you.

A burnt child dreads the fire..