Many of the large data types (image, raster, audio, etc.) store their data on the default device, or defdisk. This is a choice made by the data type designer. Relational data is stored in the reldisk. Together, your reldisk and defdisk are where all of your data is stored. If they are erased, your data is lost (in the event of a crash, you can recover from the log files, as long as you do not delete your defdisk and reldisk). In addition, your defdisk and reldisk must always have been created in the same server lifetime, and cannot ever be used apart safely. This is because the reldisk contains records which may reference objects in the defdisk. If one is deleted, the other must be deleted as well, and you should remove your log files too. The command cleandisk accomplishes this task without your having to manually delete any files.
On Windows NT, The files reldisk and defdisk and the log files must be created on a local device. Shore V2.0 for Windows NT does not support files located on network mapped drivers.