SSD - Solid State Drives

The requirements for memory in the field of electric power systems protection and control are constantly increasing due to the recording of short circuit faults with high sampling rates from numerous multifunctional IEDs, recording of wide area disturbances using synchrophasors from IEDs with PMU capabilities, large setting files, test plans and many other types of data files that need to be stored.

On the other hand, in our industry typically the requirements are for devices without moving parts. One of the exceptions for many years has been the hard drive, due to the lack of other accessible technology at the time.
In the last few years this has been changing due to the introduction and quick improvements in solid-state drives (SSD,) which are typically SLC (single-level cell) devices.  As such, these drives offer superior integrity and endurance, but half the storage capacity of the MLC (multi-level cell) technology. MLC stores two bits instead of one per cell, resulting in double capacity, but lower endurance and integrity.

Solid State Drives offer some advantages compared to electromagnetic hard drives - they boot quicker, access data faster, and live longer than the traditional hard drives  thanks to the lack of moving parts. The speed and reliability are a welcome benefit, but it comes at a fairly steep premium compared with the dirt cheap cost per gigabyte of traditional hard drives.

There are possible security concerns regarding whether or not data can truly be erased from SSDs. A recent study indicated the difficulties in completely removing data from SSDs.
Industry experts noted that there are SSDs with native encryption capabilities that can prevent data from being seen even after a drive's end of life, and that there are existing methods for protecting your SSD data such as cryptographic erasure. When the SSD is at end of life, the user can delete the encryption keys on the drive, eliminating the possibility of unencrypting or accessing the data.

Solid State Drives offer some advantages compared to electromagnetic hard drives, but this comes at a higher cost.
Crypto-erasure involves first encrypting an SSD so that only users holding passwords can access its data.





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