What is SSD ?


OCZ Vertex 3

SSD stands for Solid State Drives. USB sticks and SD cards have been around for a while now, A SSD is multiple SD chips working in parallel with a controller to offer you higher speed. In the very near future it could succeed the traditional HDD (Hard Disk Drives).  HDD are electro-mechanical devices, Speed for HDD’s are measured in milliseconds.  In contrast SSD are pure electrical devices, speeds for which are measured in nanoseconds. The juice in terms of speed and lower latencies which are available traditionally only for RAM’s is now available for your Hard Disks. This paradigm shift has caused a relook  at many a caching algorithms written to bridge the gap between the electro-mechanical and the pure electrical devices in a computer. The only hurdle right now for SSD from being mainstream is the cost. This will surely move south.

What can SSDs offer you?

  • Much faster OS boot times.
  • Much faster program and game level loading.
  • Faster data transfers and copies.
  • Zero noise as there are no moving parts.
  • Less heat emission compared to hard drives.
  • Longer battery life for laptops due to low power consumption
  • Much more resistant to shock and vibration.
  • Much lower latency (in the 0.07ms compared to 7-9ms).
  • Higher transfer rates for reading (Up to 330 MB/s+) and writing files.


Does SSD slows down over time ?

Partly True !! SSD follows the same principle as HDD while deleting files. They DON”T delete files, they simply FLAG them as deleted. For HDD this works fine as the hard drive simply overwrites the previous file which has been marked for deletion, but SSD needs to erase the prior file before writing again. This cause the SSD’s write operation to slow down as your SSD gets filled up over time.

As I said, this is partly true. Introducing TRIM !!!


TRIM erases the file right away, allowing you to write at full speed, without having to waiting for the erase operation to conclude. Almost all SSDs support TRIM by default now.

Now, to use TRIM, you need a OS that supports it, such as Windows 7, Mac OS X and some variants of Linux. You would also need a SSD that supports TRIM .
OCZ, Intel and a few other SSD manufacturers offer a utility that mimics what TRIM does, for OS’s that don’t support TRIM.

-Ben Salins

** This article was compiled with the help from Vikrant Yagnick and the following URL Best SSD & HDD April 2011 | Hardware Revolution


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