Many times, after the matrix infinity install (1.91), I install apps to the memory card, alond with infinity manager.

In many versions, it worked, but in a V3, it showed the circle of the disk and MC in the browser, and could not start the application.
I had to reburn the disks with 100 MB dummy files in the beginning, to make it work.

When I put the disks in a V12 with DMS4Pro TOXIC OS0.3 it never had any problems reading.

I had the same with a MI in a V7 and Modboy 745 in another V7 with the PSX game : "Resident Evil 1" on CD-R.
The ps2 got stuck on the part, where I saw the ps1 logo.
Put the same disk in the V12 with DMS4Pro TOXIC OS0.3, it never had any problems reading it.

All is soldered correctly, and fast boot of PS2 or PSX did not make any difference.

What do you think ?