[Gllug] moving system from one disc to another

[t.clarke]

I assume that the only real doifference between the 'character' disk device
on Unix and the 'block' disk device (on either Unix or Linux) is that writes to
the character device go straight to the disk whereas writes to the block device
go via a kernel blocking-buffer.  Sp presumably writes to the character device
will be on the disk when the write completes whereas writes to the block device
will only be there after the system has synced it (or it has been explictly
synced or opened in sync mode).

Tim
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