Idea #6817: Use flash memory as write-back cache when disk is in powersave.

When running off battery its useful to minimise waking up the hard disk. For reads, this can be accomplished by caching in RAM, but for writes caching risks a loss of data if there is a loss of power or crash. Instead, writes could be cached on a USB flash device until the next time the disk needs to be spun up for a read.

With this approach available, it should be possible to get very long periods between spinning up the hard disk, but still have the security of being able to save work.

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