Best Overall
SanDisk Extreme PRO 128GB UHS-I
Key details
- Capacity
- 128 GB
- Max Read Speed
- 200MB/s
- Max Write Speed
- 90MB/s
- Video Speed Class
- V30
Video is the hardest thing you ask a card to do, because the writing never stops. What makes the SanDisk Extreme PRO our default for 4K is the pairing of a V30 rating, which rates the card for 30MB/s of sustained writing and covers 4K at the bitrates most mirrorless bodies produce, with a 90MB/s shot speed that clears the buffer between takes instead of leaving you watching a progress bar.
The 200MB/s read figure comes with an asterisk worth knowing: it is reached with SanDisk's own PRO-READER, sold separately, and an ordinary card reader gives you less. We care because offload time is the part of a shoot day nobody budgets for, and it is where the gap between a fast card and a slow reader shows up.
Reliability is the part you cannot read off a spec sheet. Long event days are the real test, a card that keeps taking writes through hours of continuous recording, and this is the model here with the longest record of doing exactly that. We put more weight on that than on a few extra megabytes per second, because a card that stops mid-take costs more than the difference in price.
What is left is the unglamorous stuff that decides whether you trust a card: 128GB covers a day of 4K without a swap, the lifetime limited warranty means a failure costs you a card rather than a purchase, and it mounts without fuss in every camera we have put it in. That combination, not the read speed, is why it sits at the top.
Pros
- 90MB/s shot speed clears the buffer between takes
- V30 rating carries 4K UHD recording
- Lifetime limited manufacturer warranty
Cons
- V30 ceiling stops short of 6K and all-intra bitrates
We start every 4K recommendation here: V30 sustained writing, 90MB/s bursts, and the steadiest long-day record in this group.