This article is from the CD-Recordable FAQ, by Andy McFadden (firstname.lastname@example.org) with numerous contributions by others.
BURN-Proof (or BurnProof) is an unfortunate abbreviation of "Buffer-Under-RuN
Proof". The technology allows you to avoid buffer underruns by suspending
and restarting the write process when the recorder's buffer is about to
empty. (See section (4-1) if you're not familiar with buffer underruns.)
Ideally, the results of interrupted and uninterrupted writes would be
identical. In practice, there may be a small glitch at the point where
writing was suspended. Sanyo recommends 4X or higher speed CD-ROM drives
and audio equipment made in 1995 or later for playback.
The general consensus is that these technologies are effective and do
not result in noticeable glitches.
There are several different, competing technologies. Here's a sample
of what's out there (note that many of the names are trademarked):
Buffer-Under-RuN Proof. The first. Can restart the laser after a buffer
underrun. For details, see http://www.sannet.ne.jp/BURN-Proof/faq/.
Can restart the laser after a buffer underrun. Data gap length is
less than two microns. See
Just Link (AOpen)
Can restart recording after a buffer underrun. Data gaps are less
than 2 microns. http://www.aopen.com/products/cdrw/JustLink.htm.
Same as Ricoh's JustLink?
ExacLink (Oak Technology)
Can restart the laser after a buffer underrun. See
Appears to be the same as ExacLink. Mitsui's pages refer to
"Oak Technology's ExactLink(tm)".
SMART-BURN (Lite-On IT)
Smart Monitoring & Adapting Recording Technology for BURNing. Can
restart the laser after a buffer underrun, and will reduce the
recording speed if it thinks the media can't be written safely at
the requested speed. See http://www.liteonit.com/english-s-tech-7.htm.
Waste-Proof Write Strategy. Does some extra work to prevent the
buffer underrun from happening in the first place, but won't save
you if one actually happens.
Can restart the laser after a buffer underrun, and will reduce the
recording speed it if thinks the media can't be written safely at
the requested speed. Data gap length is less than one micron. See
Seamless Link (BenQ, Philips)
Another one (no details available?).
Power Burn (Sony)
And another one.
Yet another one.
All of these are for situations where your computer is unable to send
data to the drive quickly enough to keep the buffer full. They will not
help you if your computer loses power, your software crashes, your media
is of poor quality, or you smack the drive hard enough to disrupt the
Nearly all CD recorders announced in or after 2001 featured some variation
of buffer underrun protection.
Some related technologies:
Just Speed (AOpen)
Reduces the record speed if it doesn't think the media can handle it.
See http://www.aopen.com/products/cdrw/justspeed.htm. Probably
implies running OPC (section (5-11)). Combined with Just Link.
Smart Speed (BenQ)
See above; combined with Seamless Link.
See above; combined with FlextraLink.
There are usually lots of trademarked names on the specifications, touting
the benefits of SMART-X for audio extraction or the VAS Vibration Absorber
System. It's unclear whether one manufacturer's implementation is really
any better than the others, or in many cases what they even do.