At this stage, I would recommend a CF card on an internal 2.5" IDE adapter if you really want flash storage.

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In case you use an internal CF-IDE adapter for the PB1400 be sure to get either an industrial grade CF card or a recent CF card supporting UDMA. Due to a quirk in the PB1400's ROM it cold boots only from media in the internal hdd bay identified as _fixed_ media. The CF card types mentioned above usually work for this purpose. Most consumer grade CF cards identify as _removable_ media and will not be recognized properly as long the system software has not loaded an appropriate driver.