FSLock Technical Details (changes)

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FSLock

» FSLock Technical Details

FSLock Technical Details

The FSLock Module Overview

The FSLock module provides the functionality to protect CMOS RAM and other filing systems such as the hard disc against unwanted modification. This is achieved by intercepting any SWI that alters the filing system contents or CMOS RAM, and returning an error instead.

Currently, FSLock can only protect drives 4 – 7 on any one filing system. It is important to note that two areas of a protected disc are excluded. They are:

• $.Public – This location is commonly used for general file storage by the end user. It cannot be created while the computer is in a locked state.
• $.Scrap.ScrapDir – This location needs to remain writeable to allow Scrap transfers of files between applications.

Lock States

The following table details the different Lock states.

Lock Status

The lock states are passed to commands using the lock status.

Passwords

• Passwords are case sensitive.
• The Configure application restricts the password to at least five non-space characters that are acceptable in a writable icon. Although the SWIs will accept any null terminated string, it is advisable to follow the five non-space character limit, otherwise users will be unable to enter a valid password.