Definition: The initial high data transfer rate a storage device achieves before slowing down during sustained use.
Explanation
Burst speed refers to the rapid data transfer rate a USB flash drive or other storage device can achieve for a short period, typically due to caching mechanisms like pseudo-SLC cache. This speed is often much higher than the device’s sustained write speed, which is the rate it can maintain over longer transfers once the cache is full. Burst speed creates the impression of fast performance initially, but it does not reflect the device’s long-term data handling capability.
Example
When copying a large folder to a USB flash drive, the transfer speed may start at 300MB/s, showing a fast burst speed. However, after about 20 seconds, the speed drops to 80MB/s or lower as the cache fills and the drive switches to its slower sustained write speed.
Who This Is For
This term is important for technology enthusiasts, IT professionals, and consumers who want to understand the real-world performance of USB flash drives and other storage devices beyond marketing claims.
Related Terms
sustained speed, pseudo-SLC cache, NAND flash, BOT, UASP
Also Known As
initial speed, peak speed, cache speed