more info here

Storage virtualization integrates physical storage devices into what appears to be a single pool of data. It does this by aggregating storage capacity from multiple devices and presenting it as a single entity to the server, thus eliminating redundant hardware and making storage more efficient in terms of cost.

A VDR (virtual data room) can be used to streamline due diligence processes and raise funds from investors by allowing different parties to work in a safe environment. VDRs provide a range of tools that simplify project management and ease collaboration. However they can be costly and do not have the advanced features that are included in cloud storage solutions.

Cloud storage services allow users to store and retrieve data remotely through a browser, which reduces the need for costly hardware redundancies. However, they do require a faith that your company’s information is stored securely by a third-party.

Block storage virtualization, a software program, creates a barrier that is able to separate the physical disk drives from the operating system. This allows the drives to be read more quickly than if the data were directly read from the drive. It also eliminates a separate hardware platform, such as RAID for managing storage devices.

File virtualization focuses on the NAS storage architecture, which allows enterprises to optimize their storage usage, consolidate servers and perform non-disruptive file transfer. This is accomplished by eliminating the need for physical directories as well as files systems and providing advanced functions such as caching and tiering at the storage virtualization levels.