Hard Disk Sentinel is a program designed to monitor and test hard drives and SSDs. The main purpose of Hard Disk Sentinel is to find, diagnose and fix problems in the operation of the disk. It also supports external USB and e-SATA drives. The user of the program has the ability to view reports on the current state of the disk, its temperature, baud rate and other parameters. The program runs in the background and checks the drive using S.M.A.R.T. technology. If errors or unusual disk behavior are detected, the program notifies the user and offers him possible ways to solve the problems. This gives the user the ability to predict drive performance issues and troubleshoot them in a timely manner.