RebootIn computing, rebooting is the process by which a running computer system is restarted, either intentionally or unintentionally. Reboots can be either a cold reboot (alternatively known as a hard reboot) in which the power to the system is physically turned off and back on again (causing an initial boot of the machine); or a warm reboot (or soft reboot) in which the system restarts while still powered up. The term restart (as a system command) is used to refer to a reboot when the operating system closes all programs and finalizes all pending input and output operations before initiating a soft reboot.
Hang (computing)In computing, a hang or freeze occurs when either a process or system ceases to respond to inputs. A typical example is when computer's graphical user interface (such as Microsoft Windows) no longer responds to the user typing on the keyboard or moving the mouse. The term covers a wide range of behaviors in both clients and servers, and is not limited to graphical user interface issues.
Check DiskCheck Disk (CHKDSK) est un logiciel utilitaire en ligne de commande disponible sur les systèmes d'exploitation DOS, OS/2 et Microsoft Windows, qui indique l'état d'intégrité d'un disque dur ou d'un média amovible, et peut réparer certaines erreurs logiques. La commande est implémentée en tant que fichier exécutable, CHKDSK.exe. Sur les systèmes à base de Windows NT, chkdsk peut aussi vérifier les erreurs physiques ou les secteurs en erreur, ce qui était auparavant réalisé par la commande scandisk.
System timeIn computer science and computer programming, system time represents a computer system's notion of the passage of time. In this sense, time also includes the passing of days on the calendar. System time is measured by a system clock, which is typically implemented as a simple count of the number of ticks that have transpired since some arbitrary starting date, called the epoch. For example, Unix and POSIX-compliant systems encode system time ("Unix time") as the number of seconds elapsed since the start of the Unix epoch at 1 January 1970 00:00:00 UT, with exceptions for leap seconds.