Sentry 2020 provides encrypted virtual volumes. All information (files, folders, file system structures) stored on a Sentry volume is transparently encrypted/decrypted every time an application performs a read/write operation on the volume. Without a correct password, Sentry volume is just a large file with encrypted contents. When the correct password is provided, the volume is mounted, and appears as a drive letter (Windows XP/2000/NT) or as a folder in the root directory (Windows CE). Any application can then work with the contents of the mounted Sentry volume without noticing the encryption being performed on the fly.