In working condition:
2x500000MB 1 external, 1 internal
3x320000MB 2x internal, 1 external
1x120000MB SSD internal
1x80000MB SSD internal
2000MB x2 (retired)
1000MB x4 (retired)
512MB x1 (retired)
256MB x1 (retired)
128MB x1 (retired)
4MB x1 (retired)
Broken one doesn't count, there could be some more flash drive, ide or older sata drives lying somewhere in working condition in drawers somewhere in my room but I am too lazy to find out. I feel guilty for not putting them in use, they were once my fastest/biggest (like toy story 3).
Sadly, non of the flash drives are usb 3.0 so the fastest portable external storage is the 500000MB 2.5 portable HDD on usb 3.0 enclosure.
Also, I don't know why people saying the caviar green drive fails a lot, my terabyte drives for storage are green drive and non fail so far.