PowerGuard^® is a patented intelligent internal power source that is added on to a standard E-Disk drive as an extra layer of optional hardware and firmware utilities. It is used:

1. to ensure that all data in the E-Disk cache are stored into Flash memory without being lost or corrupted in the event of ungraceful power shutdowns; and/or
2. to securely erase all data in the E-Disk quickly and irretrievably, if the user chooses to do so. Erasure of data can be done manually or automatically, locally via a command through the system interface or even independently of the host system or presence of an external power source.

PowerGuard^® Levels and Operating Modes

PowerGuard^® offers three different levels of data protection, namely: PowerGuard^® I, PowerGuard^® II and PowerGuard^® III.

PowerGuard^® III offers the highest level of data protection. It incorporates a 3-position manual switch that is located on the mechanical assembly containing the charge-carrying devices and its associated circuitry. This allows the user to select any of the three operating modes:

Save Mode

All data in the write dirty cache is automatically transferred from volatile to non-volatile memory in the event of external power degradation or loss.

Erase Mode

All data is completely and irretrievably erased from the non-volatile memory in the event of external power degradation or loss.

Standby Mode

PowerGuard^®initiates system shut down upon external power degradation or loss. Standby mode allows the disk to be removed from the external power source and transported for an extended amount of time, while maintaining the ability to erase all the non-volatile memory upon activation of an easily accessible push button switch.

PowerGuard^® II supports either Save or Erase Mode while PowerGuard^® I comes only with Save Mode.

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