Because UMD belongs to Sony patent.
Without its authorization, other manufacturers cannot produce UMD discs.
There are currently no drives that support UMD.
Only PSP can read UMD discs.
There is no equipment to burn. No other device can read it.
UMD records are not pirated.
Version 2.5 is here. Wait a minute. There will be cracks in the future Watch a movie and listen to music now.
It is suggested to pay more for a 1.5. The price is not much more expensive.
Mine is 1.5.