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The X25-E is currently only available as a G1 drive and it uses SLC. It is designed for enterprise use, but if you write a lot it will still degrade just like MLC. As it is a G1 drive you don’t have TRIM support from Intel, so a secure erase is the only way to get degraded performance back. I used to have a couple of X25-E’s and would run a secure erase whenever I did a fresh install or re-image, which was about once every three months or so.
You don't need to do this however. Only do it if performance is dropping badly.
A secure erase should be done with Hdderase.
I don't think you should worry about degrading performence.
The E's doesn't degrade that much, it does depend on your usage though.
I've been using E's both in servers and as boot drives and there hasn't been any reason to clean them yet.
For home use, the G2 would be a better option though. (TRIM, more space, cheaper)