If it's from the 90s it is highly unlikely to be MFM or RLL.
Some flavor of SCSI would be the only possibility aside from IDE, but I'd serious doubt it.
In addition to the above suggestion to get a USB to 2.5" IDE converter, if this is some old machine that is controlling a piece of industrial or scientific equipment, you could try using software like Acronis Trueimage to clone the contents of hard drive to the new(er) PC, and make it bootable.
From my experience, it's easy to make bad estimates because bad estimates are easy to make. If it's a big project, take your worst possible guess, and multiply by 1.5.
I've found that this rule generally holds true for most projects which have complexity or labor involved.
In the case of construction and renovation, it doesn't even need to be that big of a job to exceed the worst case guesstimate multiplied by 1.5
and wow, I really need to use preview more.
he problem with instant translation is that it undermines the choice of looking up or not. Memory comes from a really strong filter. Instant translations make you look up more words, many more than what your brain can remember. It's better you just learn 2 words from that book that will stay for life than 20 you'll have forgotten by tomorrow.
I have a simple fix your this issue of yours, make the search more tedious by forcing the user (you) to solve a Sudoku puzzle before the dictionary will give you the definition.
1 Sagan = Billions & Billions