US Patent 9021163 Determining whether a data storage is encrypted

A method, program and/or system for determining whether a data storage is encrypted. A file is written through a first path to the data storage. The file is read through a second path from the data storage. First data known to have been written in the file is compared to second data that has been read from the file. When the first data matches the second data, the first path is determined not to have encrypted the file when writing to the data storage. When the first data does not match the second data, the first path is determined to have encrypted the file when writing to the data storage.