Every week or so, my Acer laptop, when turning power-on, goes to a dark screen informing me that 1 of my disks need to be checked for consistency. I am puzzled as I have used other PCs and I never heard of this before. The PC does this check but it is very annoying as I cannot go on-line for at least 10 minutes. Do other PCs do this? Does it mean something is wrong? Is it a good thing? Is it similar to disk corruption?