[Ham-Computers] VHS to DVD

[WB6BLV]

I have been preparing to move some ham VHS tapes to DVD but there is
something that I do not understand.  My new Emerson DVD/VHS recorder seems
to not like DVDs that are the 16X speed I find in all the stores; a friend
told me that for some reason certain machines will only accept 'slow' DVDs
so I tried an old 4X and the machine accepted it instantly.  I though the
'faster' media was back compatible, so what is going on here?

Color me Confused in California

John
WB6BLV at inreach.com