In a method for detecting errors in computer data in a memory, a check sum is calculated in runtime and compared to a stored check sum. In this method, the computer data is being subdivided into at least two logical blocks and a check sum is calculated for each logical block. Also provided is a computer unit having a processor and a memory which has a ROM in which firmware is stored, and/or which has a RAM, the memory having at least two logging functions for logging established memory errors, e.g., errors in the ROM and/or the RAM.