7 ms·
I feel like this is not ideal for an external enclosure. Sudden power loss could lead to corruption and data loss if the data is buffered in DRAM.
by choilive 3y ago
I feel like this is not ideal for an external enclosure. Sudden power loss could lead to corruption and data loss if the data is buffered in DRAM.
- jsheard 3y agoIt will depend on the SSD controller, but AFAIK the DRAM usually isn't used for write caching. It's used to hold a copy of the bookkeeping structures which map virtual block locations to physical flash locations, which are mirrored on the non-volatile flash anyway, but are much quicker to random-read from DRAM. If you use a DRAM-less drive in a situation where it can't DMA host memory, such as in a USB enclosure, it has to read those structures from flash on-the-fly which is obviously slower.