prl Posted February 22, 2010 Report Share Posted February 22, 2010 I have three backup sets, on two of them, Retrospect has the DVD+RW as being 4.3GB, and calculates reasonable Space Free values for them. On the third it says each of the five members is 16.9GB, and that the "spare space" on the full ones is ~12.6-12.9GB. Further, it says that the total capacity of the set is 33.5GB, which is neither 5*4.3 (21.5) nor 5*16.9 (84.5). What's going on with this? Quote Link to comment Share on other sites More sharing options...
Mayoff Posted February 22, 2010 Report Share Posted February 22, 2010 Do you have data compression turned on? Are these dual layer disks? Quote Link to comment Share on other sites More sharing options...
prl Posted February 22, 2010 Author Report Share Posted February 22, 2010 (edited) Hi, Robin. I have compression on for two of the backup sets, and off for the third. Retrospect shows the DVD+RWs as 16.7GB in one of the two compressed backups. The other compressed backup and the non-compressed one show the capacities of the DVDs as the normal 4.3GB. The two compressed backups are alternating backups of the same data sources. All the DVD+RWs are single layer, 4.7GB capacity discs. My DVD drive doesn't support dual layer RWs. [color:red]Edit[/color]: I have done a Recatalog on the backup set that's showing 16.7GB DVD capacity, but before I noticed the odd capacity values. Edited February 22, 2010 by Guest Quote Link to comment Share on other sites More sharing options...
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