You have to be VERY careful with TDKs. About a year ago I bought two identical spindles of 50 (before I knew anything about manufacturers) and later discovered that one was made by CMC (arse) while the other was made by Mitsui (ace). There was no visbile way of discerning which disc was which, and the packaging was completely identical. There are also TDK discs manufactured by Ritek, Taiyo Yuden and I think a few others.
Given that this is so unpredictable, I've switched to buying the Verbatim Super Azo discs, because these are
always made by Mitsubishi, who are good
http://forums.afterdawn.com/thread_view.cfm/12824 may be of use to anyone who is stuck/confused/etc
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