Advanced Technology and SanDisk TLC
We've learned from controller makers that you can't just slap TLC flash to a regular controller and expect the drive to last. The tools used to increase MLC endurance are used as a base and then expanded on. The Ultra II uses three new technologies to increase endurance.
The first is a generational update to nCache. nCache, then nCache Pro have now led to nCache 2.0. The technology started out as a SLC layer managed by the flash translation map. In the new 2.0 form, all data writes are first past through the SLC layer. This increases performance, but also reduces X3 flash wear, since the data sent from the SLC to the TLC is sent as sequential data.
The difference is like moving several small items from one room to another. You can take each item one at a time and make several trips, or you can put them in a box and move them once.
The Ultra II uses more SLC area than previous generation nCache, now around 320MB per 128Gb die.
The transfer takes place using what SanDisk calls "On Chip Copy". This occurs with little intervention from the controller.
The data the SLC blocks to the TLC blocks in the same package.
Multi Page Recovery is a RAID like page-level parity system that ensures data protection over the life of the drive.
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- Page 1 [Introduction & Specifications, Pricing and Availability]
- Page 2 [Advanced Technology and SanDisk TLC]
- Page 3 [SanDisk Ultra II 240GB SSD]
- Page 4 [Test System Setup and ATTO Baseline Performance]
- Page 5 [Benchmarks - Sequential Performance]
- Page 6 [Benchmarks - Anvil Storage Utilities]
- Page 7 [Benchmarks - Mixed Read / Write Workloads]
- Page 8 [PCMark 8 Consistency Test]
- Page 9 [PCMark 8 Consistency Test - Continued]
- Page 10 [Benchmarks - Power Testing]
- Page 11 [Final Thoughts]
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