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4mb unformatted, 2.88mb formatted (depending on format, of course).

Toshiba made a model PMF-2ED "4MB Extra High Density" also marked "ED". Here is a picture of one:

http://www.zimmers.net/tmpsampleeddisk.jpg

(I'm fixing to auction 110 of them, so I googled around to find out how common they were).

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Related Questions

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