SHUTTING DOWN THE COMPUTER INCORRECTLY OR RUNNING THE BATTERY UNTIL IT IS DEAD CAN HARM YOUR DATA.
Removing the power while the Hard Drive is reading or writing data requires the HD to shut down into a safe state within milliseconds not to lose any data. This is a tall order and to expect it to work every time without fail is hoping the controller designers got their sums right. From our experience we know occasionally, just occasionally, they get it wrong. We know this because we see the results – data corruption has occurred and the user has lost access to their files.
It is important to know that the new SSD’s (Solid State Drive) are just as vulnerable. In addition, SSD’s have a finite life span. The take away from this is BACK UP YOUR DATA.