Thomas Gast Posted June 12, 2012 Report Share Posted June 12, 2012 We have just moved to Retrospect 9.0.2 from a previous version. Our first two Backups however have been showing us something strange. We receive no errors and the checksums read as correct but when we compare the file size in the finder versus what Retrospect displays they are different sizes. EX: First backup is 437G but retrospect says it backed up 412.7G Second Backup 470G but Retrospect says it backed up 444.1G Stranger still, when we pull back an individual file for confirmation it will say it is the wrong size in Retrospect but upon restore it is the same size as the original in the finder. I will include some screen grabs for clarification. Any Help would be much appreciated. Thanks. Quote Link to comment Share on other sites More sharing options...
Lennart_T Posted June 12, 2012 Report Share Posted June 12, 2012 It's the old GB vs. GiB problem. Retrospect doesn't use the same "GB" as Finder. http://wiki.answers.com/Q/How_many_megabytes_are_in_a_gigabyte 1 Quote Link to comment Share on other sites More sharing options...
Thomas Gast Posted June 12, 2012 Author Report Share Posted June 12, 2012 Thanks for the fast reply! That's what I was thinking but I'm glad to hear someone confirm it. We are coming from Version 6.1.230 which did use the same "GB" as Finder, so we wanted to double check before clearing some of that material. Thanks again. Quote Link to comment Share on other sites More sharing options...
Lennart_T Posted June 12, 2012 Report Share Posted June 12, 2012 Thanks for the fast reply! That's what I was thinking but I'm glad to hear someone confirm it. We are coming from Version 6.1.230 which did use the same "GB" as Finder, so we wanted to double check before clearing some of that material. Thanks again. Actually, it's the new Finder that changed in Snow Leopard.I assume you ran Retrospect 6 on something older than Snow Leopard? New MathLastly — and whether this is a bug or a feature is really a matter of opinion — the new Finder has changed how it calculates kilo, mega and gigabytes. By traditional computer conventions, thousands and millions are not base-10 numbers, but are the nearest power of two. A kilobyte was 1024 bytes, a megabyte was 1,048,576, and a gigabyte was 1,073,741,824. The new Finder dispenses with old geek habits in favor of powers of ten (which is consistent with the latest terminology standards). A thousand is a thousand, a billion is a billion — not a billion plus 7.4%! As a result, not only will you get some real disk space back by installing Leopard, it will also look like you got even more, because what was 50 GB of free space when calculated using those powers of two in Leopard is now 53.7 GB as calculated using the tens system you learned in Kindergarten, which is what Snow Leopard uses. http://www.macintouch.com/specialreports/snowleopard/finderqt.html Quote Link to comment Share on other sites More sharing options...
ggirao Posted June 12, 2012 Report Share Posted June 12, 2012 It's the old GB vs. GiB problem. Retrospect doesn't use the same "GB" as Finder. http://wiki.answers....e_in_a_gigabyte 1 byte == 8 bits ;-) Simple Quote Link to comment Share on other sites More sharing options...
prl Posted June 12, 2012 Report Share Posted June 12, 2012 1 byte == 8 bits ;-) Simple No, the difference between GB (gigabyte) and GiB (gibibyte) is that 1GB = 109 bytes =1000000000 bytes; 1 GiB = 230 bytes = 1073741824 bytes, about 7% more. Quote Link to comment Share on other sites More sharing options...
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