Harddrive Anyone know what harddrive I can put in this computer? I'm trying to fix it for a friend but I cannot find what type of harddrive to put it in. Whats the difference between an ATA-6 and a Serial ATA drive? Never dealt with a laptop before.

There are different hard drive technologies (ATA, SATA, SCSI), so it is important to get the same type when replacing a hard drive. Product information on this device can be found here: http://h10025.www1.hp.com/ewfrf/wc/prodinfoCategory?lc=en&cc=us&lang=en&dlc=en&product=331508 According to this doc, this system came with a 40GB E-IDE (or ATA) drive. http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00249214&lc=en&cc=us&dlc=en&product=331508&lang=en This is a pretty standard drive, and you should be able to buy one at most consumer electronics stores. Many notebook drives can be found here: http://www.pricewatch.com/m-101.htm Searching for HP Pavilion will give more specific results for your desired model. This one site lists all the possible hard drive upgrades for your model: http://www.comptick.com/hp-compaq---pavilion-notebook-ze4420us-memory-ram-hard-drives-battery-batteries-upgrade-options.html

You are best putting in the same speed hard drive as came out, ATA 6 has a faster transfer rate 100mbps as opposed to ata/ultra ata being around 66mbps, these are readilly available although more expensive than a regular desktop HDD.