The algorithm that generates the number is designed to provide unique IDs until the year A.D. Retaining the UUID The Universally Unique Identifier (UUID) is a 128-bit number uniquely assigned to your computer at production and stored in the EEPROM of your system board. Install the ThinkPad Hardware Maintenance Diskette Version 1.73 or later and restart the computer. After you have replaced the system board, restore the serial number by doing the following: 1. Note: The serial number of the system unit is also written on the label attached to the bottom of the computer. The serial number of each device in your computer is displayed the serial number of the system unit is listed as follows: v 20: Serial number Write down that number. Install the ThinkPad Hardware Maintenance Diskette Version 1.73 or later, and restart the computer. Before replacing the system board, save the original serial number by doing the following: 1. If you replace the system board, you must restore the serial number of the system unit to its original value. These numbers need to remain the same throughout the life of the computer. FRU replacement notices Restoring the serial number of the system unit When the computer was manufactured, the EEPROM on the system board was loaded with the serial numbers of the system and all major components.
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