IBM PS/2 Model 70 or compatible floppy drive wanted (Or help with current one?)

Hey all, i'm having a fair amount of trouble with my PS/2's floppy drive... wanted to back up my BBS and none of the disks i put in would read or format! Oddly though, it WILL boot a disk that's inserted on power-on. I hear it try and hit the disk a few times while in dos repeatedly before failing with the R/A/F options ... and format tries to read it, then goes attempts to format it, and can't find sector 0 ..... I'm really confused about those symptoms since it boots the only bootable disk I had on hand - ironically spinrite 6 (I'm aware of how useful it is...) - so i'm looking at replacing it ... or figuring out what's wrong with it that it can boot a disk just fine, but not use one while in DOS ? .... and by wiggling the floppy a bit I just got it to format a disk while in the ... drive, and now it's making the noise it did before and stalling occasionally. Perhaps the disk just isn't catching fully? -- Gary G. Sparkes Jr. KB3HAG