Testing a Permanent Digital Storage Archive | Digital Preservation Matters

Testing a Permanent Digital Storage Archive โ€“ Part 1. Chris Erickson. September 9, 2015.
For about the past seven years I have been testing the M-Disc permanent digital storage media. The M-Disc is designed to use inert, permanent materials, so that digital data written to the discs are permanent.
The original M-Discs were in the standard DVD format that can hold up to 4.7 GB. This works well for MB or GB collections but it becomes a bit cumbersome when working with many TBs. It takes 213 DVDs to hold 1 TB of data. (I am looking forward to the 200 GB M-Discs, which would be 5 discs per TB.)
http://preservationmatters.blogspot.com.au/2015/09/testing-permanent-dig...

Testing Permanent Digital Storage Archive โ€“ Part 2: OAS and Rosetta. Chris Erickson. September 10, 2015.
The Optical Archive System from Hitachi LG Data Storage fits in a server rack and can contain 10 units, called libraries. Each library unit contains 100TB of data storage on 500 long-term optical discs. More information at Rosetta Users Group 2015: New Sources and Storage Options For Rosetta (slides 13 โ€“ 16) or this YouTube video.
Connecting the OAS and Rosetta Systems:
Once the optical archive was installed in our Library, it was then connected to our Rosetta system, which was very easy to do and only took a couple of minutes. In the Rosetta administrative module I created a new File storage group with the OAS path and the storage capacity. The IE and Metadata storage groups were left as they were, directed to our library server. The files in those groups are much smaller and accessed more often than the files. I then added a new storage rule so Rosetta could determine whether to write the files to our library server, to our Amazon storage account, or to the OAS.
http://preservationmatters.blogspot.com.au/2015/09/testing-permanent-dig...