adding a 2nd disk to a 1 disk series 1

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Is it pretty straight forward to add an additional disk to a series 1 UK tivo? It's got a 40 in it & I want to add another 40 until I get round to buying another drive at which point I'll go back to one. I want to try out mode 0 & install my cache card etc.

Any pointers?

[classicsat]

Mostly.

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just gone through the MFStools readme & looks ok so I'll have a play