I've had no troubles with my factory installed IBM 6Gb and added IBM 20Gb drives, so far... Please do read the FAQ about upgrading very thoroughly, It has some hints and tips you are looking for (washers, isolation).

Good luck!

Edwin de Vaan
mk2 rev.7 # 080000263 (queue 1232) 6+20Gb blue/red
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Edwin de Vaan aka FLaSHmAStER