I found 2 drives, which are labeled:

1) 3.5'' drive from Apple.
2) 800K drive drom Apple.

The questions are:

A) Can I connect both of these to my IIsi ?
B) If I take an internal High Density floppy (1.44 Mb) and put in the external case. Can my SE recognize that it's High Desnsity ?
C) Can I boot my SE with external floppy drive ?

The Godfather.

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Quadra 630,Quadra 605, IIsi, Performa 400 andd a SE.

At anyrate, there is at least one model where you can replace the DSDD drive mechanism with a DSHD mechanism. It will allow you to read 1.44MB disks, but only on machines which support it. For the most part, the SE did not support high density disks. There was an upgrade, but you have to replace 2 ROMs and the SWIM (?), so it is not very common.

I believe that you can boot the machine from an external drive. (I don't think that the Macintosh distinguishes between the two.)

The ''800K External drive'' model : M0131.

The ''Apple 3.5 Drive'' model : A9M0106

hope it helps, of course these are the model numbers, and not the serial no.

I guess I will have to pass the SE ROM upgrade, but what about the IIsi ? Can it recognize them ?

The Godfather.

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Quadra 630,Quadra 605, IIsi, Performa 400 andd a SE.

2) While you cannot use a 1.44mb floppy disk in those drives (both are 800k drives) if you happen to have a couple of apple 1.44mb drive (SuperDrive) mechanisms laying around, you can swap them out for those 800k drives and all will be hunky dory

3) yes, you can boot from an external floppy, provided it has a valid system folder

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