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The below information is directly from the Blackmagic website showing tests they have done using the Video Assist - read more at Blackmagic
It is important to use high speed UHS-1 SD cards. These are some SD cards which we (Blackmagic Design) have tested using ProRes HQ.
The following SD cards will record at a maximum of 1080p60 and are recommended when using HFS+ or exFAT:
- SanDisk Extreme Pro 16GB SDSDXP-016G-A46
- SanDisk Extreme Pro 32GB SDSDXP-032G-A46
- SanDisk Extreme Pro 64GB SDSDXP-064G-A46
- SanDisk Extreme Pro 128GB SDSDXP-128G-A46
- SanDisk Extreme Pro 256GB SDSDXP-256G-A46
- SanDisk Extreme Pro 512GB SDSDXP-512G-A46
The following SD cards will record at a maximum of 1080i60 using HFS+ or exFAT:
- Lexar Professional SD XC 600x 128GB
- DelkinDevices 633x 8GB
The following SD cards will record at a maximum of NTSC using HFS+ or exFAT:
- SanDisk Ultra SD HC 8GB
- SanDisk SD HC 8GB
- Transcend SD HC 8GB
The following SD cards are discontinued and are not recommended for recording on Blackmagic Video Assist:
- Panasonic SDHC Gold Series 16GB
- Panasonic SDHC Gold Series 32GB
Important Notes About SD Card Speed
Please ensure your chosen SD card is UHS-1 only. The above list are the SD cards we (Blackmagic Design) have currently tested, however there are many other available SD cards which will be compatible. It’s worth testing your card’s speed using Blackmagic Disk Speed Test to accurately measure whether your SD card will be able to record at the rate you require. Blackmagic Disk Speed Test uses data to simulate the storage of video so you can get results similar to what you’ll see when capturing video to an SD card.