There are several differences in features and functionality that really stand out in my mind that make the ioSafe a superior product. One of the biggest is that the ioSafe Solo is waterproof as well as fireproof. Water damage is likely in a fire event due to sprinkler systems or fire department efforts. Also, water damage due to plumbing problems, water supply system damage, or flooding is a real concern. The next major point is that the ioSafe delivers 500 GB in a single drive, and offers up to 1 TB or even 1.5 TB in the same enclosure. The ioSafe drive is 7200 RPM, a higher performance drive than the 5400 RPM offered by the MediaVault. Next we discover that the ioSafe Solo offers a 1 year data recovery warranty up to $1000 with a 3 year standard hardware warranty, and this can be upgraded to a 5 year hardware warranty with 5 years of data recovery service for an additional $99.
Granted, the ioSafe Solo offers less fire protection, with a lower temperature rating (1550 deg. F versus 1700 deg. F) and only for 30 minutes of time at that temperature. I'm not sure how much difference that would make in the event of an actual fire as I'm not an expert in the physics involved, but my risk management opinion is that we're trying to mitigate the risk, and can't eliminate it. Best practices involve having off-site backups of your most critical data.Another technical point is the use of a dedicated power supply for the ioSafe, and because the Solo is a single USB drive rather than two USB drives with separate USB connections, only one port is used up, and does so without drawing on USB power. Couple all that with the far lower price of the ioSafe and we start to see why it's the far better value. Granted, the MediaVault should be able to support larger drives if you purchased them (separately), and the MediaVault does provide additional storage space for other media or documents. The MediaVault should be resistant to water from above, but wouldn't protect against submersion. The lack of a cable-lock for the MVHD counts against it as well.