On disc swapping doing damage... I wouldn't do it like you have to for the psx... it is a very rough procedure to stop the motor on mid-spin, rip off the disc, slap another back on while the motor is trying to spin... I can see harm to the motor doing that, but bleh, personally, I would rather mod a ps1 with an easy to solder 8 wire stealth modchip or use a psp or xbox1 with an emulator than bother that with that operation. Personally speaking, I would only do the sensor mod to use cogswap if I had to for some reason.
PSTWO Slim Silver v15 NTSC/US
PSP Slim Silver Daxter Edition 5.00-M33 custom firmware
Xbox1 60gb Hard drive all softmod with UnleashX
Xbox1 Stock HD Red/Black Case Softmod UnleashX
Fire Red GBA-SP