A method to protect a tape and data on it from critical conditions of a tape drive by using a watch dog timer
Original Publication Date: 2000-Dec-01
Included in the Prior Art Database: 2003-Jun-19
Figure 1 Disclosed is a method to protect a tape and data on it from critical conditions of a tape drive by using a watch dog timer (WDT). A tape needs to be protected from date erasure including servo data and from physical damage like tape breakage when the tape is being used in a tape drive even if CPU or other circuit function becomes abnormal. Figure 1 shows a block diagram of this method. An output signal of WDT is connected to Reset LSI, to Motor Circuit and to CPU. When CPU and other circuit are operating normally, trigger pulses are output from a device (Servo LSI in figure 1). As a result of these pulses, WDT does not assert its output signal.