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SanDisk Ultra II 240GB SSD Review - SanDisk TLC NAND Flash takes shape (Page 2)

Chris Ramseyer | Sep 12, 2014 at 12:00 pm CDT - 1 min, 12 secs time to read this page
Rating: 92%Manufacturer: SanDisk

Advanced Technology and SanDisk TLC

SanDisk Ultra II 240GB SSD Review - SanDisk TLC NAND Flash takes shape 03 | TweakTown.com

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.

SanDisk Ultra II 240GB SSD Review - SanDisk TLC NAND Flash takes shape 04 | TweakTown.com

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.

SanDisk Ultra II 240GB SSD Review - SanDisk TLC NAND Flash takes shape 05 | TweakTown.com

The Ultra II uses more SLC area than previous generation nCache, now around 320MB per 128Gb die.

SanDisk Ultra II 240GB SSD Review - SanDisk TLC NAND Flash takes shape 06 | TweakTown.com

The transfer takes place using what SanDisk calls "On Chip Copy". This occurs with little intervention from the controller.

SanDisk Ultra II 240GB SSD Review - SanDisk TLC NAND Flash takes shape 07 | TweakTown.com

The data the SLC blocks to the TLC blocks in the same package.

SanDisk Ultra II 240GB SSD Review - SanDisk TLC NAND Flash takes shape 08 | TweakTown.com

Multi Page Recovery is a RAID like page-level parity system that ensures data protection over the life of the drive.

Last updated: Apr 7, 2020 at 12:33 pm CDT

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ABOUT THE AUTHOR - Chris Ramseyer

Chris Ramseyer started his career as a LAN Party organizer in Midwest USA. After working with several computer companies he was asked to join the team at The Adrenaline Vault by fellow Midwest LAN Party legend Sean Aikins. After a series of shake ups at AVault, Chris eventually took over as Editor-in-Chief before leaving to start Real World Entertainment. Look for Chris to bring his unique methods of testing Hard Disk Drives, Solid State Drives as well as RAID controller and NAS boxes to TweakTown as he looks to provide an accurate test bed to make your purchasing decisions easier.

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