I just buy CDRs and DVDRs for non-important data (like movies, data that aren't mine etc). Yun lang. I know it's the cheapest stuff from China so reliability is out of my expectations. EVERYTHING they sell is disposable and unreliable.

So obviously, essential stuff that exceed 100 pesos, I buy from trusted stores and official dealers for USB drives, memory devices etc. Most of the time, wala pang 50 pesos and difference, may warranty pa.