On Thu, 28 Jun 2001, Richard Erlacher wrote:
  The power requirements are the same, i.e. the DC
supplies work for any
 of them, though not all drives require the negative supply, but the
 connectors for AC are often different for DS drives than for SS
 drives.  Siemens FD800-2's are notable exceptions. 
NOT ALL 8" drives have the same power requirements!
Check the power requirements and pinouts CAREFULLY before connecting!
Drives WILL be damaged if you connect "connectors that fit" without
confirming that the drive uses the same voltages on the same pins.