SSD stands for Solid State Drive. SSD’S do not use Mechanical Components like HDD’S. HDD’S use Disks to store and retrieve data by revolving very fast at about 5400rpm or 7200rpm, but SSD’S use chips to store and retrieve data. SSDs are faster than HDDs because the speed of HDD depends upon the rate of revolution of the disks contained inside, where as SSDs have no such concept of disks.
History of SSD :
SSDs were offered in the late 1980s by Zitel as a family of DRAM-based products, under the name “RAMDisk”, for use on systems like UNIVAC and Perkin-Elmer. In 1999, a number of introductions and announcements were made by BiTMICRO, about flash-based SSDs, including a 3.5-inch, 18GB SSD. In 2007, a PCIe-based Solid state drive was announced by Fusion-io. It had a capacity of doing about 100, 000 I/O operations per second (IOPS) of performance in a single card, with storage capacities up to 320 GB.
Characteristics of SSD :
- Start-up Time –
Because SSDs do not use any mechanical component hence it takes almost negligible startup time.
- Random Access Times –
Accessing data directly from the Flash memory creates a lag-free experience for its users.
- Read Latency time –
Accessing data from Flash memory also reduces the read latency time to very low.
- Data transfer rates –
Higher Data Transfer rates of about 100-600 Mb/sec.
- Fragmentation –
There is no such concept of Fragmentation in SSDs.
- Noise –
As they have no mechanical part they create zero noise.
Advantages of SSD :
- Higher performance rate as compared to HDD
- Energy uses are very low
- Highly durable.
Disadvantages of SSD :
- Cost of SSDs is very high
- Storage capacity is low compared to cost
- Lifecycle of SSDs is shorter than HDDs
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