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The Ultra II offers rather impressive performance numbers for a TLC drive as even the smallest 120GB model is capable of 550MB/s read and 500MB/s write. Winimage. The secret behind the performance is the new nCache 2.0, which takes SanDisk’s pseudo-SLC caching mode to a next level. While the original nCache was mainly designed for caching the NAND mapping table along with some small writes (<4KB), the 2.0 version caches all writes regardless of their size and type by increasing the capacity of the pseudo-SLC portion. https://softwaretele.mystrikingly.com/blog/male-voice-changer-online. nCache 1.0 had an SLC portion less than 1GB (SanDisk never revealed the actual size), but the 2.0 version runs 5GB of the NAND in SLC mode for every 120GB of user space.
nCache 2.0 Overview: Icash 7 5 9 – personal finance tracker. It comes with a capacity of 120 GB, 240 GB, 480 GB and 960 GB in all. Moreover, SLC Cache Size is 5 GB, 10 GB, 20 GB and 40 GB respectively. The interesting tidbit about SanDisk’s implementation is the fact that each NAND die has a fixed number of blocks that run in SLC mode. The benefit is that when data has to be moved from the SLC to the TLC portion, the transfer can be done internally in the die, which is a feature SanDisk calls On Chip Copy. This is a proprietary design and uses a special die, so you will not see any competitive products using the same architecture. Normally the SLC to TLC transfer would be done like any other wear-leveling operation by using the NAND interface (Toggle or ONFI) and DRAM to move the data around internally from die to die, but the downside is that such a design may interrupt host IO processing since the internal operations occupy the NAND interface and DRAM.
OCZ’s “Performance Mode” is a good example of a competing technology: once the fast buffer is full the write speed drops to half because in addition to the host IOs, the drive now has to move the data from SLC to MLC/TLC, which increases overheard since there is additional load on the controller, NAND interfaces, and in the NAND itself. Performance recovers once the copy/reorganize operations are complete.
SanDisk’s approach introduces minimal overhead because everything is done within the die. Photo mechanic 6 0 turbo. Since an SLC block is exactly one third of a TLC block, three SLC blocks are simply folded into one TLC block. Obviously there is still some additional latency if you are trying to access a page in a block that is in the middle of the folding operation, but the impact of that is far smaller than what a die-to-die transfer would cause. The On Chip Copy has a predefined threshold that will trigger the folding mechanism, although SanDisk said that it is adaptive in the sense that it will also look at the data type and size to determine the best action. Idle time will also trigger On Chip Copy, but there is no set threshold for that either from whatever it specifies.
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