How do I re-reinstall Mavericks?

i have a macbook late 2009 (6.1). i just upgraded with a new 240gb SSD, which I installed myself. I used my old harddrive to boot from, using CMND+R. i formatted the new SSD and installed a clean version of Mavericks to the newly formatted SSD. all was well. unfortunately, i used migration assistant and it brought over user preferences i did not want. so, i want to reformat my new SSD drive, again, and reinstall Mavericks, again.

however, taking the same steps as i described above produced very different results the second time. this time, i am unable to reformat the SSD, and it returns an error saying that it cannot unmount the disk because it is locked. i tried following other posts, which are not definitive and extremely unhelpful, and the advice of repairing or verifying the disk does not work. the error message returned when i try this is that "live repair" of the disks is not supported.

so, to re-cap... the problem here is definitely not an old harddrive. and the CMND+R recovery has not helped me yet. i cannot revert to an older OS like mountain lion because on both the new internal SSD and the old external drives have Mavericks on them.

i can start the computer and work in the new SSD 100%. but like i said, i want a clean install this is not negotiable. i want the old user preferences off, and i want to build my new harddrive from the ground up with only fresh downloads, apps, etc. so how can i accomplish this?