Korg Oasys Operation Manual page 237

Disk and Media information Operations that the OASYS can perform on media
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* : WAVE files on external USB media can only be
previewed from disk if the file name is eight characters
or less. This restriction applies only to external media,
and not to the internal hard drive.
Note: If you have any questions regarding the media
that can be used, please contact your local Korg
distributor. You may also check the Korg website
(http://www.korg.com).
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