Hello. I have an Acer Aspire One AOA150 netbook, and it was showing UNMOUNTABLE_BOOT_VOLUME as a stop error for windows XP. I tried using the Recovery Console to repair the disk errors, but the utility gave me an error saying the drive had one or more unfixable errors. After this, the hard drive was no longer recognized by the BIOS. What can I do to fix this problem? If the problem requires a hard drive replacement, what size hard drive do I need to get (1.8" or 2.5")?