There were (apparently) some models of the Macintosh SE that could read 1.44MB floppies, though the SE is werid:
1.) 800k SE's can't read 1.44MB disks, no matter if they're formatted as 800k
2.) 1.44MB SE's can't read 800k disks at all
The drives are only capable of reading disks of their native format. It's a total pain in the ass. And to make things better, the ROM *also* has to match the drive, so if you have an 800k SE, you can't just replace the drive with a 1.44MB drive. That's all info I pulled from Low-End Mac, and it sounds like a royal pain in the ass. Congrats on an SE, though...I love old computers, and old Macs are magical (I swear!)
edit: Nevermind, that was the Mac Plus. The SE is 800k only, and can only read 800k disks, not 1.44's formatted as 800k.
"And and if you start to bleed, stop wiping." -whm1974