05-28-2020, 03:30 PM #16
Sometimes the notification emails from Mac Forums come in so late that they are off the bottom of the screen by the time they show in my inbox and I miss them.
I'll try the apps Randy posted, but I know already that the user_library_mail folder is 7GB smaller on Mojave (as I posted above) - I just don't know if that means not all emails were migrated or Mojave just has a more efficient way to store them.
- 05-28-2020, 08:49 PM #17
I tried Disk Inventory X, but that didn't help much.
To start with that add gives results that I don't even understand
Like a size of 3,40.7 for the size of the Seagate drive (the Mojave OS and all Data)
Or the user folder on that drive with a size of 2,56.7GB
But in general it doesn't provide any more info than what I can get from the Mini via the macOS.
05-28-2020, 10:00 PM #18
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It does seem like the biggest discrepancy is in the Users folder.Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.
PS: When there is an accident or error, is the tool to blame or is the fool to blame?
05-28-2020, 10:21 PM #19
05-28-2020, 10:43 PM #20
When I went through the sub-folders of the Users folder, the big discrepancy of about 7GB was the users_library_mail folder.
I have to boot back into El Cap to do a message count of the various mail folders, and I have a lot of them.
Could be that Apple Mail in Mojave has a more efficient way to store messages or their attachments to explain the difference.
Not sure I want to spend too much more time on this - I'll keep the old spinner internal as a back up in case I find out later that some data is missing, but right now everything looks fine.
05-29-2020, 12:18 PM #21
This app I think is good to compare maybe a folder, but not two 500GB drives - it seems to go through the data bit by bit, just takes forever and with me it never finished.
And, say Mojave uses a better compression algorithem than El Capitan for some files, I assume DirEqual would flag that as being different even though in practice the data is still retained properly.
I think the app is great to check and validate a back-up but not to compare the data after migrating to a new macOS.
On the weekend, I'll try to find some time to compare the Mail message and folder counts between Mojave and El Capitan - if those are not wildly different I'll just forget about the discrepancies.
Just strange that I couldn't find anything related to this on google - people are always asking "Where did my hard drive space go?", not "Where did 25GB of free hard drive space come from?"
05-29-2020, 04:03 PM #22
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Give DaisyDisk a try. Nice graphical display to help you find big hitters.Jake
06-03-2020, 08:25 AM #23
I haven't done any more investigation on this 25GB disappearing, but based on the recent threads, discussions and articles on the pros and cons of HFS+ and APFS, I think the 25GB disappearing might be perfectly normal since APFS is more efficient in the way it stores and handles some data.
25GB sounded a lot to me initially, but it's only about 5 1/2% of the 450GB total space used.
06-03-2020, 08:37 AM #24
Just about everything on the chart on the left, over a certain size, is a tiny bit smaller in the chart on the right. Now, if you don't see any apps or documents that are missing, and your Mac is running just fine, that would seem to indicate to me that, indeed, APFS is a bit more efficient in how it stores things.
And when I think about it, it makes perfect sense. HFS+ was optimized for RDHD's. And so it left room on the physical platter between things for them to grow as you added new data to them, so they would still be contiguous for optimal read performance.
But APFS is optimized for SSD's. SSD's don't need to leave any room between things, as they don't read things based on physical heads moving to different places on a platter. Nothing needs to be contiguous because an SSD can access bits of data strewn across a bunch of registers all at the same time. So there is a lot less wasted space.Randy B. Singer
Co-author of The Macintosh Bible (4th, 5th, and 6th editions)
Mac OS X Routine Maintenance • http://www.macattorney.com/ts.html
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