6.3.20 Monitoring of Hard Disk Media  An indication of imminent disk failure may be an increase in bad data blocks. It is typical for the latest disks to show bad block errors even from new and most data systems manage the bad blocks by reassigning the address of that block. However, if the quantity of bad blocks increases it may indicate that the disk is beginning to fail. Software exists which will provide a warning of increased bad data blocks, as well as measuring other physical characteristics that may indicate disk problems.