Borrow / use part of TM hard drive

Hi all, I haven't been able to find an answer already present in this forum. I'm using an external hard drive for TM only, backing up my iBook. I need some disk space asap to use with my iBook because its disk is nearly full. No time to get another disk or thumb drive. Is it possible to use some of the TM drive space, i.e create a directory and use it temporarily for stuff, without messing up TM? I think so - obviously assuming the directory is outside the TM directory structure. Can anyone advise ? TIA - Terry.

It's not a good idea, but as Kappy says, it will work.
Just be sure not to completely fill the disk, or Time Machine will get very cranky.

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