auxiliary storage
external storage
secondary storage

Compare external storage which need not have a permanent connection to a computer:

Then over to the right, that low flat shed, that's external storage and parking.

However, there are a variety of situations in which external storage is preferred:

Again, to external storage, but not for immediate access.

Second, full encryption of the internal and external storage is supported.

Bear in mind that replacing your computer's hard drive requires you first to back it up to external storage.

It is possible to reduce precision in external storage only.

Using external storage, we would create the following structures:

To print a complete list of families and their members using external storage, we could write:

The computer could thus only be used with external storage.