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METHOD FOR TRACKING POWER-ON TIME OF A DEVICE WITH NO OVERHEAD

IP.com Disclosure Number: IPCOM000013732D
Original Publication Date: 2000-Apr-01
Included in the Prior Art Database: 2003-Jun-18

Publishing Venue

IBM

Abstract

Described is a method to record accumulated power-on time in a device without having having to use any extra storage space. This method applies to devices with non-volatile storage managed as a file system, where the files have time stamps. The time stamps may all be written as the accumulated power-on time of the device instead of absolute time (or no time at all). At power-on, the machine’s accumulated power-on time may be determined by reading the time stamps, and then incremented as the machine operates. No extra storage is needed in the non-volatile storage devices. The accuracy of the time calculated at power on will be determined by how often files are changed, since power-on time that occurs between the last update of a file and power off is lost. If the device has to update files frequently for other reasons, the precision would be quite good. If not, files can be updated periodically to force better precision, though at the cost of more wear on the device. This methodhas the following elements: