You are ordering external HDDs for use in your office, they are likely to be used for storing sensitive information such as PII and intellectual property. What is a good way to ensure the confidentiality of these external HDDs?
Only full disk encryption will ensure the data is not readable by malicious users. The file system will not matter as their security features can be easily bypassed by using an operating system that ignores them. For example Linux operating systems can be configured to ignore NTFS permissions which would allow access to any data on the disk.