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The main problem is gathering the metadata and keeping it up to date. One time I was unable to use my H2O for *at least* 10 minutes after I unplugged its USB. That may be okay if you purposefully initiate a full scan, but otherwise…
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I haven't experienced that with KoReader yet. In contrast to KoReader, Nickel seems to import the metadata after unmounting the device, so whenever I put a new epub on the device via USB, it imports that metadata and makes it available for search. For one epub, this takes seconds on my Kobo Clara HD. Recently I wiped the memory and put more than 2,000 new files on it. Took about 10 minutes to import.
In KoReader, the "extract and cache book information" produces all the metadata necessary for a useful search function, and it's odd the metadata is unavailable for search after extracting it, only for displaying the files in a list.
For a useful search function, a database with the book title, description, author would already be enough. No need to keep that up to date all the time, only when a file is replaced. Some kind of "speed up book information database" function could help delete orphaned metadata, for instance, to remove the metadata of those files that no longer exist on the device.