My best advice, double check the mfg's site re the warranties on the drives before purchasing. Whenever there's any question, I always go to the mfg's site to verify warranties....link below.
http://support.wdc.com/warranty/policy.asp?custtype=end&lang=en
Based on the retail kit product number "WD5000JBRTL" looks like it may be a 3 year warranty.
WD Caviar Blue (WD Caviar, WD Caviar SE, WD Caviar SE16)........ Bulk ..... Retail ......................................................................................................................3-year ......3-year3
Product Designator: BB, LB, JB, PB, JD, JS, KS, KD, KS, ABKS, AABS, AAJS, AAKS, AABB, AAJB, AAKB
Frequently Asked Questions
1 Any Non-Kitted Hard Drive sold to Authorized WD Distributors.
2 Effective for products purchased since March 1st, 2007.
3 Effective for products purchased since August 1st, 2007. Drives purchased previously have 1 year warranty.
4 Effective for products purchased since March 1st, 2007. Drives purchased previously have 2 year warranty.
5 Effective for products purchased since October 1st, 2007. Drives purchased previously have 1 year warranty.
VAPCMD
"Here's the answer I got from Amazon about the warranties:
I have checked and found that the Western Digital 500GB 7200RPM 8MB Buffer Ultra ATA/100, 3.5INCH, 8.9MS Seek, Caviar Series Se Re has 1 year warranty and the Western Digital 500 GB Caviar Blue PATA 7200 RPM 16 MB Cache Bulk/OEM Desktop Hard Drive WD5000AAKB has 3 year limited warranty as yo have seen in our website. Many of the items listed on our website are covered by a manufacturer's warranty. This information should be listed in the owner's manual for the product.
It's not exactly what I was hoping for since I don't have the manuals. I recall being told once by a tech person where I work that if something is going to fail on some equipment it generally happens early on, which is why he never bought extended warraties that are optional.