Well, for now it wouldn’t really reduce my spinning external drives because a 2 TB SSD just isn’t going to replace 4 and 5 TB drives!
Actually, I just looked at the present memory usage of my iTunes folder and Photos folder and they use more memory than I thought. Presently about 950 GB. The 2 TB drive would take about 500 to back up the internal drive so that means, of the 1.5 TB left, I’ll already be filling up two thirds of it! I do buy movies from time to time so it could fill up the rest in a shorter time than I’d like. Of course, I could keep the itunes stuff on the spinning drive. Or wait for prices to drop so a 3 or 4 TB SSD is affordable.
It’s hard for me to know if the speed is okay because I’ve never had a high speed external drive. I do know, on my iMac, using USB-A, one time I had to boot from the external drive because the main drive had gotten corrupted. So I did that and then ran superduper to copy from the external drive to the main drive. Then I could boot from the main drive again. But it took a LONG time to boot up with usb-A (not sure what versyon it was, but certainly nothing less than 3.
Any comparison of how bootup times would compare? I’ve never seen any data on these things.
??? There is something in a small section internally that hold some of the OS, even if booting from an external drive?
Finding more odd things. I’ve been cleaning up some stuff by putting some miscellaneous files on an external drive. So the storage listing says 311 GB free.
But even stranger results in Disk Utility.
If I select the “Apple SSD” at the top of the listing, it only gives the size of the drive (basically 500 GB).
Going down to the next level beneath that which says “Container disk1”, it shows 4 things I had not noticed before in the thermometer graph:
VM = 3.22 GB
Mac HD = 473 GB
2 Not mounted = 717.7 MB (no idea what that is)
Free = Only 23 GB! That’s less than I saw before in the next item before I moved things off the internal drive!
Under that section it says the volume count is 4. Don’t know here that comes from. And it repeats that only 23 GB is free (477 used). On the upper right corner, where there is a box saying “499.96 GB”, right under it is says “shared by 4 volumes”.
Then we have the third level which says “Mac HD”. It’s thermometer graph has almost 4 gb on “other volumns”. Again, don’t know what that refers to. And it also says only 23 GB free.
Below that graph there is a section that says 311 GB available, but 288 of that is “purgeable”. Still makes no sense to me.
Biggest questions are what the heck is the deal with “4 volumes”! I believe there is a hidden recovery volume but that doesn’t account for 4.
The other is how much free memory I really since the numbers are not making any sense. Inconsistent and actually, on most, going down after I took stuff off the drive! Only the “storage” info went the way I would expect.