Archive for the ‘ Hard Drives ’ Category

Solid State Disk

Posted on April 22, 2010 by | No Comments

SSD stands for Solid State Drive or Solid State Disk. It is also called a flash drive, the next generation hard disk. SSD uses a special kind of memory chip with erasable, writeable cells that can hold data even when powered off. It might help to think of an SSD as the larger version of the memory stick. The external look of SSD is almost no different than a traditional hard drive. This design is to allow the SSD drive to put in a notebook or desktop computer in place of a hard drive.


SSD and USB flash drives have lot of similarities. Both use the same type of non-volatile memory chips that retain their information even when they have no power. The difference is in the form factor and capacity of the drives. While a flash drive is designed to be external to the computer system, an SSD is designed to reside inside the computer in place of a more traditional hard drive.

Comparison SSD with Traditional Hard Drive
Compared to standard hard drive, SSD device has no discs and read-write heads or a motor that spins the disc. Instead it contains an SSD device a special type of memory chips with rewritable cells that can retain data even when they are denied. SSD does not generate significant heat. It is also lighter than a standard drive, more power efficient, and completely silent. Finally, the SSD is more durable. If dropped or banged it isn’t as likely to be damaged.

SSDs are also immune to strong magnetic fields which could sanitize a hard drive.SSD Disk provides a faster access time than a hard disk, because the SSD data can be randomly accessed in the same time whatever the storage location. The SSD access time does not depend on a read/write interface head synchronising with a data sector on a rotating disk. The SSD also provides greater physical resilience to physical vibration, shock and extreme temperature fluctuations.

SSD storage medium is not magnetic (like a hard disk) or optical (like a CD) but solid state semiconductor such as battery backed RAM, EPROM or other electrically erasable RAM like chip such as flash.

Advantages of SDD
•  SDD is more reliable compared to traditional Hard Drive.
•  SSD can extend the life of a notebook battery.
•  SSD consumes less power than conventional hard drives.
•  Weight of SSD is comparatively less, that in turn decrease the weight of the notebook.
•  SSD device creates no noise.
•  Search time for an SSD device is much lower than on a hard drive.

Drawbacks of SDD
•  SDD is expensive compared to traditional Hard Drive. (The price per GB of storage capacity is significantly higher for SSD than the HDD.)
•  The SSD also has a life expectancy of erase/write cycles, after which it no longer performs reliably.
•  SSD has a significantly slower write time than a standard drive.
•  An SSD unit has an expected number of read and writes cycles. When the number of cycles at the limit, the device will function worse.