This area of memory is used to hold configuration information for the hardware in your system.
At boot time the BIOS checks this area of memory and if no changes have occurred since the last bootup, it knows it doesn't need to configure anything and skips that portion of the boot process.
Windows 95 reads the ESCD to see if hardware has been changed and react accordingly.
Windows 95 also allows users to override Plug and Play resource assignments by manually changing resources in the Device Manager.
This information is recorded in the ESCD area so the BIOS knows about the change at the next boot and doesn't try to change the assignment back again.
The ESCD information is stored in a non-volatile CMOS memory area, the same way that standard BIOS settings are stored.
Note: Some (relatively rare) systems using Windows 95 can exhibit strange behavior that is caused by incompatibility between how Windows 95 and the BIOS are using ESCD.
This can cause an "Updating ESCD" message to appear each and every time the system is booted, instead of only when the hardware is changed. drive with a hd with xp on it when i power it up it goes thrugh all the normal things but then comes up with updating ESCD...NOTE: Using robot software to mass-download the site degrades the server and is prohibited. First, it would take time to do something that it has already done before, each boot, for no purpose. Please consider a donation to The PC Guide Tip Jar. If the BIOS were to assign resources to each Pn P device on every boot, two problems would result.After all, most people change their system hardware relatively infrequently.Second and more importantly, it is possible that the BIOS might not always make the same decision when deciding how to allocate resources, and you might find them changing even when the hardware remains unchanged. The ESCD area is a special part of your BIOS's CMOS memory, where BIOS settings are held.