i have a 4.37 gb DVD-R but it only holds 136 mb.. why is that?

Because you're not using it correctly.

It would help if you tried explaining the type(s) of files that you're transferring/burning to the DVD, and what format you're burning the DVD in. i.e. is it data, audio, movie, etc.?
 
If the disc is used b4 then you might have disabled Addition writing on the disc so u cant write anything and the space will be locked
 
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