Feeds
85%
Samsung SSD 840 series

Samsung SSD 840 series storage review

MLC for business and TLC for pleasure

  • alert
  • submit to reddit

Application security programs and practises

Cell division

The 840, on the other, hand uses the company’s 21nm Toggle three-bit per cell TLC (Triple Level Cell) NAND and is the first drive to market using this type of NAND Triple Level Cell NAND (TLC) Triple Level Cell or TLC NAND is an alternative to shrinking the NAND die to try and get a better density by increasing the number of bits per cell. Instead of using 1-bit per cell (SLC) or 2-bits per cell as in normal MLC NAND, TLC uses 3-bits per cell.

Samsung SSD 840 series

Same enclosure, yet vastly different tech in the SSD 840 and SSD 840 Pro

The more bits that can be packed in per cell means more GB per die and therefore more GB on a wafer without the need to shrink the die. However everything in the garden isn’t rosy. The performance of TLC NAND suffers in comparison with the other two types due to the number of control voltages used for reading and writing to the memory.

SLC has just two voltage levels to check, so random reads are very fast while MLC, with its four voltage levels, takes twice as long. TLC has eight voltage levels, so it takes twice as long again, so random reads take longer and, potentially, so does any programming.

But that’s not the only drawback with TLC featured in the basic SSD 840, the elephant in the room is NAND endurance. The actual P/E (program/erase) figures for TLC are not available yet, but as a ball park figure, it’s thought to somewhere between 1,000 and 5,000 cycles compared to the 5,000 – 10,000 of MLC or the 100,000 cycles of hyper expensive SLC NAND flash.

Given these various factors, just how well do the 840 and 840 Pro compare to each and what more do they have to offer in relation to the SSD 830? Read on.

Samsung SSD 840 Pro

The 840 Pro range capacity starts with the 128GB (£120) and goes up to 512GB (£450) and I've the 256GB (£203) unit to test. The Pros are only available as bare drives and come with a 5 year warranty.

Samsung SSD 840 Pro

SSD 840 Pro layout

Given its business focus, the firmware (DXM02B0Q) for the 840 Pro is aimed at producing high performances under heavy loads. In addition to the 256-bit encryption, it also has WWN (World Wide Name) enabled and LED indicator support. These last two features are particularly useful when the drive is integrated into storage or server systems.

The Power of One Infographic

Next page: Samsung SSD 840

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Application security programs and practises
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Securing Web Applications Made Simple and Scalable
Learn how automated security testing can provide a simple and scalable way to protect your web applications.