We have tracked all the computers and and all the drives we have installed in our shops in Utah, New Mexico, Colorado, and Arizona. We have always provided a three year warranty... rare in this business. We now provide a five year warranty on computers with a new Seagate drive installed. What we state is what we have learned in our repair and service business.
It does vary by drive, with Seagate as tops, Toshiba second, Western Digital as third most reliable laptop drive. But the very high failure rates of Hitachi, IBM Travel Star, Samsung, Tri-Gem, Maxtor, and Fijitsu bring the overall rates down.
Seagates last, on average, 44 months. Western Digital 32 months, Hitachi and IBM Travelstar 28 months, and all others come down to 23 months for 20 GB drives. 6 GB, 10 GB, and 12 GB drives are much higher.
We do see drives that last 7 years. We see a lot more which do not last a year. And many Hitachi drives do not last 7 months.
We install 11 drives per week, to a variety of customers.
We do have databases on all products and failure, which in general we are contracted not to release.
The highest failure rates have been in Western Digital and Hitachi 40 GB drives in the 7200 rpm category. Lowest rates have been in the Toshiba 20 GB and Western Digital 20 GB drives. Consistent high failure rates have been in Fujitsu and Samsung, but we do not buy enough of them to make an accurate comparison
We are now seeing extremely high failure rates on drives larger than 80 GB, and any drives over 60 GB with 7200 rpm.