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It possible to have a slightly simplified wb in rom, to save space, and then load the big abd more feature enabled one from disk if available. WB in rom is basically required for floppy boots.
In fact it's ideal to have a possibility to load any component from disk if it is available and then defer to rom based version, this would also allow easier future updates.
So that makes scsi (ide) device the only really essential component to be updated, unless it can be made intelligent and load a new version from rdb like filesystems do to be future proof too. Then again ide is not going any further then 500GB drives? Or 2TB via adaptors?
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