In August 2007 I purchased from Best Buy a Western Digital MyBook external harddrive, 160 Gigabites. It carried a three-year guarantee.
In April 2008 this hard drive stopped working. Best Buy said you must return it to Western Digital.
Western Digital's site said the three-year guarantee had expired.
An e-mail to Western Digital brought a reply confirming that the guarantee had expired--because the guarantee time stared at TIME OF MANUFACTURE. TS to me, in short, since when I bought the hard drive new its guarantee already was nearly expired. No more WD harddrives for me.