Yes, potentially fatal flaw. SSDs work in blocks. Every block accounts for amount of storage space. Everytime windows boots it uses a block. Now, on 7, this isn't a problem because it will use the same black or erase the block it just used without damaging it at all. However, Vista and XP and all Macs do not do this. They corrupt the block at boot up. Significant damage will take a very long time but less time than it takes a HDD to crash. So if you don't have 7, don't bother.