Based on the cheapest HDD, DVD and Blu-ray (per GB) I came across from my area, this is what I worked out:
[li]2TB WD Caviar Green - â‚¬68.87 [/li][li]= ~3.44c per GB[/li][/ul]
[li]Ritek 16x DVD-R 4.7GB â€“ 100 pack bundle - Â£14.99 = ~â‚¬17.27[/li][li]= ~17.3c per DVD-R[/li][li]= ~3.63c per GB[/li][/ul]
[li]Aone 4x BD-R 25GB â€“ 50 pack bundle - Â£36.45 = ~â‚¬42[/li][li]= ~84c per BD-R[/li][li]= ~3.36c per GB[/li][/ul]
To my surprise, Blu-ray disc is now cheaper than DVD per Gigabyte, but then again, Iâ€™ve read mixed reports about Aone media and who’s willing to sit in front of a PC to burn 80 BD-Râ€™s one by one to backup a full 2TB HDD.
While bare HDDs are very fragile, itâ€™s just a matter of putting the HDD back into the original packaging and storing it away. If it falls while in its packaging, I would sooner bet my data on it than a spindle of discs falling off a shelf on to a hard floor. For reading/writing, just use an eSATA HDD docking station.
I know many would agree that its safer splitting data across 80 BD-Rs than risking the failure of a 2TB HDD, but Iâ€™ve seen where one ended up with a bad batch of media (i.e. most or all discs unreadable after several months.) So for critical data, Iâ€™d say use two hard disks, storing one offsite (e.g. friendâ€™s house)