External drives are 50 pin scsi narrow.
Confusion:  
The scsi cable connector on the back of the mac is a DB 25 pin connection.
Therefore you will need a 25 pin to 50 pin cable.
Although confusing, 
this 25 to 50 thing has been a mac thing for a long time, 
so lots of cables are available.

My advice:
Get an external at this time. This allows an easy way to boot, if the internal gets 
goofed up.





Janice Best wrote: 
> So if I get an external, it needs to be 25 pins, and if I get internal, it
> can be anything with the proper adaptor?
> 
> I'd like to add a drive,  not  sure ...
> ... internal or external.  I know external costs more.  I
> found a site that shows how to add an internal, and a cooling fan ...
> http://www.geocities.com/glenstrek/7500_2nd_Drive.html

> Janice
> 
> --

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