Flash drives tend to have a maximum number of writes per "section." I understand it is around 100,000 right now. That is ok for somemthing that is user-directed (cuz there's no way you're getting anything like that by hand) but as a hard drive... you'd max out after awhile.
Ah, but if you have very large amounts of very cheap storage - why delete anything? You have a persistant versioned FS instead and never have to worry about accidentally deleting something you shouldn't again :-)
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Yeah... but your file system needs to get updated as you add onto it. Each update to a section is another write.
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