Every manufacturer has a bad batch now and then, also some drives with a hiddious reputation sometimes will run for eons..
My experience after the odd 11.000 computers is that Samsung has been very consistent in terms of quality and reliability, they are almost boring in that respect, each generation and each revission of a hard drive type will either be totally the same or a good incremental yet not spectacular improvement over the old one.
Seagate is company that either makes incredible drives or they're rubbish, I own several types of MFM drives by them, one of them being a Seaget ST412 which was originally made for a 1983 IBM XT the drive is rated to operate for about 11.000 hours, its now
27(!!!) years later and it STILL works flawlessly, the old IDE Decathlon drives were excelent and very fast except a certain type, the later Medalist U4 types were meh in terms of reliability and even more meh in terms of performance, the later U8 were better but long term reliability sucked, nowadays its still the same, some are great, others not so.
Western Digital usually makes well build drives, they however do sometimes overtax themselves and try to push for speed and performance a tad to much, old WD's are great, 40 and 80 Megabyte Caviar drives of the old days were more then excelent.
Maxtor was a very up and down company, the early IDE drives were magnificent, later on they nearly went bust and produced shitty harddrives, then Hyundai bought them, quality went up like a rocket and until they merged with Seagate they had generally good drives.
Hitachi is becomming a second Samsung, their drives just work, usually they don't have the big ups and downs like Seagate, I've got a few of their drives some ata and some sata and after 4 years none of them failed.
In the old days you had a lot more companies...
Seagate of course,
Alps Electric, also a big Floppy drive manufacturer.
WD
Maxtor
IBM
Miniscribe, horrible, horrible HORRIBLE, build about the worst drive possible in the MFM era, they went bust HA HA HA serves them right...
NEC, used to make very high quality drives of their own design, later on the build IBM drives under licence and then quit the business.
Microscience
Kyocera
Kalok (argh!)
Rodime
Quantum, and no fireballs do not go down in a ball of fire, I've got two of them, one is used in a Cyrix 200+ machine, the other inside a Celeron 466 they both are fine.
Conner, used to hate them because their jumper settings were impossible to figure out and EVERY drive type had a different scheme, so if you (after a year or so) figured out how the hell you had to jumper a CFS 210 A then you still couldn't make heads or tale out of the ludicrious scheme they used on a CFS 420A *headdesk* they do keep going and going and going..
Fujitsu, used to make nigh indestructible 3.5" desktop drives, they were very reliable but only a fraction faster then a Quantum bigfoot, soooo damn sloooooooow, also very quiet.
Tandon, used to make good MFM drives, they were on the slow side though..
I'm not sure Excelstor still operates, they make Hitachi drives under licence, I had one of them which has worked fine for 4 years, I've replaced it with something bigger, will see if it still works..