A CDE Definition
A solid state drive (SSD) feature that improves write speed. SSDs use flash memory, which writes an entire block of storage no matter how few pages within the block are updated. This requires reading and caching the existing data, erasing the block and rewriting the block. If an empty block is available, a write operation is much faster.
With support required in both the OS and SSD, the TRIM command enables the OS to inform the drive which blocks are no longer needed. It allows the drive to erase the blocks ahead of time in order to make empty blocks available for subsequent writes. See solid state drive.
solid state drive
An all-electronic storage device that is an alternative to a hard disk. Employed in myriad products, including mobile devices, iPods, cameras, laptops and desktop computers, solid state drives (SSDs) are faster than hard disks because there is zero latency (no read/write head to move). They are also more rugged and reliable than hard disks and offer greater protection in hostile environments.
Mostly Flash Memory
The great majority of solid state drives use flash memory chips. Like a hard disk, flash memory is non-volatile and holds its content without power. In contrast, for the absolute fastest speed obtainable, there are solid state drives that use volatile memory chips (DRAM or SRAM) backed up by a hard disk in case of power failure (see nvSRAM and BBSRAM).
Combo drives, such as the Fusion Drive in Mac computers, comprise solid state flash memory and a hard disk (see solid state hybrid drive and Fusion Drive). The hybrid drive is more costly than a hard disk but less than a solid state-only drive. In time, however, there will only be solid state storage, and spinning disk platters will be as obsolete as the punch card (see future memory chips). See disk on module and garbage collection.
Hard Drive Replacement Kits
Less Costly Every Year
RAM, Battery and Hard Disk
A Plug-In SATA SSD
The First SSD
Early SSD PC Cards
Before/After Your Search Term
|TRIL||trimode phone case|
|trilinear interpolation||triple core|
|TRILL bridge||triple dub|
|Trillian||triple level cell|
Terms By Topic
Click any of the following categories for a list of fundamental terms.