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If you own Kingston USB Flash drives or Secure Digital cards, you already own products that incorporate Flash memory, technically called NAND Flash. Globally, NAND Flash consumption has exploded over the last 5 years, and new products, such as NAND solid-state drives, are now making significant inroads into enterprise computing devices, from notebooks, desktops, workstations and servers.
Here's a quick primer on what you need to know about NAND Flash memory.
One of the benefits of NAND Flash is its non-volatile storage of data. Unlike DRAM memory which must be powered continuously to retain data, NAND memory retains data even when the power is off — making it ideal as storage for portable devices.
There are primarily two types of NAND Flash widely used today, Single-Level Cell (SLC) and Multi-Level Cell (MLC). NAND Flash stores data in a large array of cells. Each cell can store data — one bit for cell for SLC NAND, and two bits per cell for MLC. So, SLC NAND would store a “0” or “1” in each cell, and MLC NAND would store “00”, “01”, “10”, or “11” in each cell. SLC and MLC NAND offer different levels of performance and endurance characteristics at different price points, with SLC being the higher performing and more costly of the two.
NAND cells are not designed to last forever — unlike DRAM, their cells will wear out over time when written to (Reads do not wear out NAND Flash like Writes do). So, NAND storage devices have a limited number of write cycles, although the impact on many storage devices is not significant because of Wear Leveling being carried out by the Flash controller that always resides on the device. All USB Flash drives, SD cards and SSDs have a NAND controller that manages the NAND Flash and performs such functions as Wear Leveling and Error Correction.
So, to prolong the life of NAND storage devices, the NAND Flash controller ensures that all data written is spread evenly across all physical blocks of the device so as not to wear-out one area of the NAND faster than another.
In the past two years, NAND Flash costs dropped enough to make new primary storage devices, solid-state drives, possible for client systems and servers. SSDs are direct replacements for the hard disks (or standard disk drives) in computers with compatible interfaces (such as SATA or SAS).
SSDs offer significant performance and durability advantages over standard hard drives. SSDs have no moving parts; they are all semiconductor devices. Because of this, SSDs do not suffer from mechanical latencies like hard drives do, and without moving parts, SSDs can be subjected to much more shock and vibration than a hard drive, making them ideal for a broad range of portable and mobile applications.
In years past, solid-state drives were designed with DRAM memory chips and were as expensive as luxury cars, making them suitable only for demanding server applications.
Today, with lower cost NAND Flash SSDs, SSDs are being used in a variety of applications ranging from consumer to enterprise and military computing.
Kingston's Client system MLC SSDs are rated at 20GB in typical writes per day over three years (Kingston remains conservative in its specifications). This is commonly known as the SSD's endurance.
Today's MLC SSDs are not intended for use in servers, which require much higher levels of writes per day; for those write-intensive applications, 64GB server SLC SSDs can be rated at upward of 1TeraBytes in 4K, 100% Random worst case writes per day over 3 years. Due to the higher cost and lower capacities of SLC SSDs for servers, the industry is working on a new category of server SSDs, called Enterprise MLC (or eMLC).
Most Client systems are no longer limited by processor performance. They are almost always limited by storage. Hard drives have access latencies in milliseconds, while SSDs operate in hundreds of microseconds.
An SSD can deliver new life and high performance even on systems that are a few years old (as long as they have a SATA compatible interface). An XP-based system can see its boot-up times cut from many minutes to one or less, making an SSD a performance storage upgrade. In fact, it often delivers the best performance increase of any upgrade to a system.
We will explore SSD technology in detail in future posts.
Author: Cameron Crandall - Kingston
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