<html><head></head><body><div class="ydp5af2b5c4yahoo-style-wrap" style="font-family: Helvetica Neue,Helvetica,Arial,sans-serif; font-size: 13px;"><div>During POST and before GRUB, one of my computers gives the error message<span><br></span><div><span> 3rd Master Hard Disk Error<br>and says press F1 to continue.</span></div></div><div><br><span></span></div><div>Well this PC has 3 hard drives. Which one is it? Doing a web-search I find "information" in 2 categories:<br><div><div><br><div>* Access the BIOS to turn off the test.<br><div>* Replace "the hard drive".<br><div><br><div>At first I thought "3rd" meant a specific drive like /dev/hdc. Apparently computers with only 1 drive generate the same message.<br><div><br><div>I have taken the precaution to make copies of important data on different physical drives.<br><div><br>What next?<br></div></div></div></div></div></div></div></div></div></div></div></body></html>