| This issue occurs when a diskette is formatted with PC support. The diskette becomes unmountable while the "Sonnet Processor Upgrade" extension is running on a PowerBook 1400, 1400c/117, 1400cs/117, 1400c/133, 1400cs/133, 1400c/166, and the 1400cs/166.
If there is a need to mount a PC-formatted floppy disk after upgrading your PowerBook 1400 series Macintosh, the "Sonnet Processor Upgrade" extension must be turned off. To do this, simply open up the Extension Manager Control Panel and scroll down to the beginning of the Extensions list. The "Sonnet Processor Upgrade" extension should be one of the first couple of extensions in the list. Once the extension has been located, click the checked box next to it to deselect it. Once the computer is restarted, the Sonnet extension will be turned off and a PC-formatted floppy will mount. If there is a regular need to mount PC-formatted floppies, you can eliminate a step from this process by creating an alternate set of extensions in which the "Sonnet Processor Upgrade" extension is turned off.
Note: When running the computer with the "Sonnet Processor Upgrade" extension off, the processor will still be running at its rated speed, but the L2 cache will be disabled.
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