An error message appeared just once, never again

[baronluigi]

I am triying to rip the Spanish BLURAY version of THE SHALLOWS. I am using an external USB BLURAY DRIVE, never had any problem with it. The thing is that while analysing the disc with MAKEMKV, the message of READ ERROR has appeared at the end of the log, just before the sentece "OPERATION SUCCESFULL". The message had a link to the faq attached and in there it is written that this error only happens just when is faulty drive or a faulty disk (o both things at the same time). I read in another message that some reading errors could appear when not using the program in the administrator mode. I relaunched it, analysed the disc again and no problem appeared this time.

Should I assume that it was just a random error?

Before you ask, my drive´s maximum reading speed is just up to 2X...i think that the USB power supply is able to handle such slow speed.