It is no secret that cameras are getting better all the time. In order to record 8K video, you are going to need faster memory cards. The SanDisk 640GB PRO-CINEMA CFexpress Type B Memory Card is worth a look. It is ready for 8K Video with speeds up to 1700MB/s & 1500MB/s (R/W).
This card has a durable design to withstand up to 1m drops. With sustained write speeds of 1400MB/s, you will be able to record 8K video without dropped frames.