Instruction: Answer the given question using the supporting document.

Input:
Question: Do you know what is the inner diameter of the printable surface is?
Document: I have been a user of Memorex discs for several years without a complaint. I don't know why, but these discs are terrible. The printable surface has a streak half an inch wide that isn't readily visible to the naked eye until close inspection reveals it. This streak causes the picture print to develop with a terrible looking streak when printed. This caused me to waste 7 disc worth of ink as well as the burning time.
I think AMAZON has to distinguish if these are INK JET PRINTABLE. They may only be THERMAL PRINTABLE??? Does anyone know about the bumpy glossy surface? Anyway, I am ordering a different brand that says INKJET PRINTABLE FROM NOW ON. I love memorex but this confusion on the type of surface for printing is very very frustrating. I HOPE AMAZON CLEARS UP THIS PROBLEM! Inkjet Printable should be defined in the description. The Memorex brand is good. But the SURFACE is a problem.
I don't know what all the negative reviews are about. I love these printable Dvds. I couldn't be more happier with the results. I'm having fun with my new hobbie, of gathering family videos and placing my own pictures on these discs. Absolutely delightful!
The printable surface is silver and very shiny not white and has printing on it allready, This is not what I think of when I see printable.
However I have now used probably about 8 more and not had a problem. I do question the "printable" label; the texture of the surface is very "dry" and kind of rough.
Good product and met my needs to have a printable surface. Will buy Memorex DVD-R 16x 4.7GB 100 Pack Spindle Printable again.
Great price on this spindle of DVD-R's. Nice perk that I didn't realize was that these are hub-printable. The Printable surface goes all the way to the center. Makes for very legit looking dvd's.
This was the second case of printable DVDs I have bought. The printable surface lends itself to professional artwork pulled off the web. Some of the burned DVDs were given as gifts and the recipients could not tell they were homemade.
I ordered printable DVD-R discs. Sure, I can take a sharpie and write on them but they are not blank surface (they have the memorex text and logo on each disc) inkjet printable discs. Very disappointed.
I have burned over 50 DVDs so far and every one burned as expected (no coasters!) on my iMac G5. The printable surface works great on my Epson R340 printer.I will buy more of these!
Answer: About 29/32 inch per my measurement stick.