3 ms·
In short: Aggressive overprovisioning. Enterprise SSDs are not expensive only because they have better flash chips, but they have much more of them. A top of
by bayindirh 1y ago
In short: Aggressive overprovisioning.
Enterprise SSDs are not expensive only because they have better flash chips, but they have much more of them.
A top of the line write oriented SSD comes with 4-7x more capacity than what it says on the tin, but that extra capacity is used for cell replacement rather than capacity itself.
Mixed use comes with 2-4x overprovisioning, and read oriented is around 2x IIRC.
- aaronax 1y agoI find these numbers to be way outside of what I have heard of. I would be surprised if you could give an example that comes with even 1.5x capacity. (4TB capacity, 6TB actual flash on chips, for example.)
- otherjason 1y agoOverprovisioning is much less aggressive than this in practice. A read-oriented SSD with 15.36 TB of storage typically has 16.384 TiB of flash. The same hardware can be used to implement a 12.8 TB mixed-use SSD (3 DWPD or more).