i had a 2T external drive connected to my imac. i was running time machine with back-ups going to the 2T drive. then, i ceased using the imac as my primary computer and plugged the 2T drive into my laptop just so i could access the files from the imac. then, the 2T drive broke. the information was saved and copied onto a 1T drive which is now connected to my laptop. i want to delete all but the most recent of the backups from the imac from the 1T drive. with only 1T i don't have enough space on the drive to use it for the things for which i really need it. i have seen the instructions for removing select back-ups via time machine. i can't do this as time machine doesn't recognize this drive and just wants to reformat it. what in the world can i do to get rid of all those daily back-up files but preserve the last one so i can access the files i need on my laptop?? can anyone help me?