of the drive from which the system boots. After processing the file, the system loads and executes the command shell specified in the SHELL line, or if there is no such line. The command shell in turn is responsible for processing the file.

Missing/corrupt

Even though loading CONFIG.SYS is part of a normal bootup process, the system can boot if the file is missing or corrupt. A system probably requires troubleshooting if the file gets deleted or corrupted.

Default shell

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