Not necessarily. In an external enclosure, all manner of crud can befall a 
hard-drive-to-Mac connection. I start with
 seeing what the internal hard drive's SCSI ID number is. Get Info on the 
selected hard drive does it.

I then remove the back of the Mac, an SE in your case, and hook the hard drive 
to the SCSI cable and power connector, leaving the
drive laying outside the SE over the metal frame. DO NOT GET NEAR THE 
PAPER/ELECTRIC PLUG ON THE BACK OF THE PICTURE TUBE. You can easily pop off the 
tiny glass nib and discharge the existing vacuum ruining the tube.


If it boots to a floppy with System 6, and shows up on the desktop,  then the 
issue is SCSI ID. If that external box has a switch, I set it from SCSI ID 
3(typical CD ROM number) through SCSI 6. Knowing the internal drive's ID first 
makes this part far easier. Just don't set
the external drive to that SCSI number.

If the drive stays invisible, you need to format it with HD/SC Setup, or a 
useful utility like Lido 7.56.  Here an external floppy disk drive is
handy as you need one drive for the boot software and the other for the Lido, 
etc.


Jeff



________________________________
 From: Triston Mccarthy <[email protected]>
To: [email protected] 
Sent: Friday, August 16, 2013 5:02 PM
Subject: Non -apple hard disk drives.
 

I have a non apple version of the quantum pro drive lps 270s. It still works 
and I have tested it but in an external enclosure the drive will not work with 
my Macintosh SE. I also have a Connor CP3040a I tried it in the enclosure it 
did work but only for about 5 minutes after that it just completely crapped out 
and wouldn't re initialize. I would assume I probably needs a non Apple Hard 
Disk Utility to actually connect the drive and be able to mount it.

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