Can't Find anything under that Acer model. Can you give more information or even a year built?
You may have a bad drive, try downloading SeaTools for DOS:
http://www.seagate.com/ww/v/index.jsp?locale=en-US&name=SeaTools&vgnextoid=720bd20cacdec010VgnVCM100000dd04090aRCRD
one final thought would...