There where mulitple variants of the floppy drive:
1. i think the first by looking at the closing mechanism
![](http://www.mainbyte.com/vic20/1541_floppy.jpg)
2. the standard with a lever closing mechanism:
![](http://www.bluelake.nl/oldsite2/1541.jpg)
and i think they came in black and beige
3. the one i had, a much smaller formfactor, the 1541-II:
![](http://ocaoimh.ie/ocaoimh/2012/02/C64-IMG_5372.jpg)
Which one you got there ?
but i believe the bigger ones have the powersupply build in ?
mine had a separate adapter like the one from the C64 itself