None of them are really all that bad. The worst of them is a 3TB Toshiba DT01ACA300 at 3.75%. The best are:
- 0.00% WD Black WD2002FAEX 2TB
- 0.00% Seagate NAS HDD ST2000VN000 2TB
- 0.00% WD Red WD40EFRX 4TB
Full list:
2TB:
- 2.64% WD Green WD20EARX
- 2.15% Toshiba DT01ACA200
- 1.46% WD Green WD20EZRX
- 1.05% WD Red WD20EFRX
- 0.97% Seagate Barracuda 7200.14 ST2000DM001
- 0.95% WD AV-GP WD2EURS
- 0.85% WD RE WD2000FYYZ
- 0.72% Seagate Enterprise Value ST2000NC001
- 0.49% Seagate Surveillance ST2000VX000
- 0.00% WD Black WD2002FAEX
- 0.00% Seagate NAS HDD ST2000VN000
3TB:
- 3.75% Toshiba DT01ACA300
- 1.53% WD Green WD30EZRX
- 1.51% Seagate NAS HDD ST3000VN000
- 1.44% WD Red WD30EFRX
- 1.36% Seagate Barracuda 7200.14 ST3000DM001
4TB:
- 3.08% WD RE WD4000FYYZ
- 2.54% Black WD4001FAEX WD
- 1.44% Seagate NAS HDD ST4000VN000
- 0.66% Seagate Desktop HDD.15 ST4000DM000
- 0.26% Hitachi Deskstar 7K4000 H3IK40003272SE
- 0.00% WD Red WD40EFRX
I don't really like to say which is worst based on these percentages since a large amount of HDD RMA's would be due to shipping. HDDs are fragile and sometimes delivery services toss it around anyway. And sometimes whoever you bought it from packaged it cheaply (Newegg used to be notorious for failing to package HDDs properly and ended up having to accept *alot* of RMAs because of it).