Blank CDs DVDs

What they do
We store our files/information on them.
 
Quality to consider before purchasing one
A low quality CD (and even more so a low quality DVD) has 2 main shortcomings compared to high quality CDs and DVDs:
1) less protection against scratches (and therefore it is very easy to damage them in a way that one day they will stop working)
2) they make the burner work much harder (thus shortening the lifespan of our Cd or DVD burner)

Therefore, the advantages of a high quality support are that you will minimise the chance of losing important files/data stored on your CDs/DVDs and at the same time you will prolong the burners lifespan.

Also remember that the lower the burning speed, the more the quality approximates perfection. To achieve the best results, always use a low or intermediate burning speed (e.g. 8x for data and 1x for audio). The writing quality of a CD or DVD already written can be checked with the use of applications such as Nero CD-DVD Speed (with the typical green, yellow and red dots).
 
Brands to keep in mind (Blank CD and DVD sale)

Rule of the thumb = Made in Japan. Anything Made in Japan is worth buying.

CDs
1) Maxell
2) Verbatim
3) TDK

For DVD-R
1) Panasonic
2) Pioneer
3) Maxell
4) Plextor

For DVD-R
1) Verbatim
2) TDK
3) Plextor