What is Sustained write speed?
Speed after the fast cache runs out during a long copy.
Short answer
Budget portable SSDs can fall from 1,000 MB/s to under 150 MB/s mid-copy.
Sustained write speed when buying a ssd, hard drive & memory card
Speed after the fast cache runs out during a long copy.
Why it matters: Copying 100 GB of video is decided by this number, not the peak.
Look for: Budget portable SSDs can fall from 1,000 MB/s to under 150 MB/s mid-copy.
Full SSD, Hard Drive & Memory Card buying guide