[H] Question of solid state drives

[Thane Sherrington]

I was reading a review of the new Intel MLC drive, and he says "The 
real strength of the Intel drives is in its random, small file, 
read/write performance. Here we see a 10% improvement in random read 
performance over the 1st gen drives, putting the new X25-M ahead of 
even the X25-E. Now there are obvious lifespan benefits you get from 
an SLC drive that the G2 can't match, but for a desktop user this 
thing is even better than the X25-E. "

I know nothing about SLC vs MLC - what does he mean buy "obvious 
lifespan benefits?"

T