Sandisk 64GB Micro SD Card Records 1080 ALL-I and 4K Flawlessly
Post updated January 2018: When I first bought the Canon EOS 5D Mark IV, I needed a decent, cheap SD card for 5D Mark IV video. I was told that I would need to shell out for a specific SD card or a certain type of CF card to be able to record 4K.
As I didn't have either of those around, I tried a few of the cards that I did own. Most didn't work. However, one card in particular worked perfectly. The bonus was I already had 5 of them that I use for my DJI X5 camera on the Inspire 1 drone (UAV).
I have also used two of this particular card in my Sony PMW EX1. I used them to record NON-STOP for 4 and a half days. 108 hours with no problems whatsoever.
On top of that, I have one in my Go Pro HD Hero 4 Black. And one in the new Go Pro HD Hero 5 Black. This card is the Sandisk Extreme Pro 64GB MicroSD SDXC-1 (adapter comes with the card in most cases. Genuine cards).

I was out filming the Weymouth Beach Motocross event yesterday and the cards performed as always. Here is one particular clip from that event…
Anyway, I have just tested the record times with both 4K video and 1080/50p ALL-i (highest HD setting) and these are the results.
5D Mark IV 4K/1080p Record Times With 64GB Card
The 5D Mark IV recorded in 4K/25fps, until the card was full, for 16 minutes. Not very long but long enough for me to create a whole bunch of short, 30 second to one minute clips yesterday. Also good for 30 second, 4K stock video clips.
It recorded in 1080/50p ALL-i for the full limit of 29m 59s creating a file size of 39.4GB. So, I guess you could fit around 40-45 minutes on one 64GB card.
These cards are only $15 on Amazon US:
SanDisk Extreme PRO 64GB microSDXC UHS-I/U3 Memory Card
…and £35 on Amazon UK:
SanDisk Extreme PRO 64GB microSDXC UHS-I/U3 Memory Card
Are you only going to film short 4K bursts like myself with the Canon EOS 5D Mark IV? If you don't want to shell out hundreds of Pounds or Dollars on larger cards, grab a few of these. I simply cannot fault them as a cheap SD card for 5D Mark IV video. No matter what camera I put them in!
