iBook, PowerBook Data Loss Problem Noted -- Apple has issued a Tech Info Library article cautioning iBook and PowerBook (FireWire) owners of a potential data loss problem with those portable Macs. Under certain low-memory situations, putting the machine to sleep with the "Preserve memory contents on sleep" option enabled can overwrite essential file system data. When restarted, the laptops display a flashing question mark; after booting from a CD-ROM, the hard disk fails to appear and Disk First Aid reports errors that cannot be repaired. Apple is working on a software fix to be released at the end of March. In the meantime, Apple recommends disabling the "Preserve memory contents on sleep" feature. [JLC]
Wake On Demand in Snow Leopard
Putting your Mac to sleep saves power, but it also disrupts using your Mac as a file server, among other purposes. Wake on Demand in Snow Leopard works in conjunction with an Apple base station to continue announcing Bonjour services that the sleeping computer offers.
While the requirements for this feature are complex, eligible users can toggle this feature in the Energy Saver preference pane. It's labeled Wake on Network Access for computers that can be roused either via Wi-Fi or Ethernet; Wake on Ethernet Network Access or Wake on AirPort Network Access for wired- or wireless-only machines, respectively. Uncheck the box to disable this feature.