Here are some of the potential risks related to storage media like USB memory drives, disks, etc.:
- Threat of data loss due to lack of backup.
- Threat of data loss due to anti-malware software that was not installed.
- Threat of theft due to lack of user awareness.
- Threat of unauthorized access because the password was not used.
- Threat of unauthorized access because the encryption was not used.
- Threat of unauthorized access because the data was not deleted when the memory drive was discarded.

These are only some of the risks, the complete list of risks will depend on the device that is used and the security processes in your company.