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Apple Watch says it has 4.2gb

My Apple Watch series 3 gps says its capacity is 4.2gb in the about section when should be 8gb. I understand the actual storage won’t be exactly 8 and software accounts for some but half seems like a lot.

Apple Watch

Posted on Aug 20, 2020 4:33 AM

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77 replies

Jan 12, 2021 1:04 PM in response to Deadlyraptor

It’s most annoying because I just linked my watch 3, 8gb to my new phone, however I haven’t downloaded any apps, songs, or synced any pictures to it.. and it says only 2.2gb available.. if this is the OS they should have thought about that when they put 8gb in the thing.. i can’t tell time with it like normal, every single time I look at it I have to dismiss the “storage full” warning. But I can’t take anything else off of it.. it’s empty..

Jan 17, 2021 6:17 PM in response to tylerquill

So basically we can use the 3 series out of the box as is and not add anything to it in order for it to work and do future updates. Great.

I wish I could delete native apps like mail, contacts, and calendar off the watch (because I don’t use them), to free up space for other things....namely do an update! But Apple doesn’t allow that. Ready to go back to FitBit.

Jan 27, 2021 1:22 AM in response to Malissandratos

So glad it's not just me. This happens with every incremental WatchOS update not just the big series updates.


Watch OS 7.3 showing as 191MB but yet with 2.4GB free on the watch it's still not enough once it uncompresses it. It's crazy to have to go through all this resetting and unpairing and repairing just to install an incremental update.


I thought Apple was about the customer experience? This is certainly a horrible experience from y (the customer) point of view.

Jan 27, 2021 9:32 AM in response to christof21

I'm glad this isn't just me, but saddened that it is such a near-universal issue. At least understanding it we can jump through these hoops, but the user experience is terrible enough that I wouldn't recommend the Series 3 they are still selling at all. Someday this will force me to upgrade my Watch, likely this upcoming Fall when a new model arrives. But, also, I cannot in good conscience give my current Apple Watch Series 3 GPS to anyone as a hand-me-down, so may also stick it out until Apple no longer supports it with OS updates. That, though, is likely to be beyond just watchOS 7, because, again, they are still selling it. I guess that I'll be redoing things like Apple Pay with each watchOS update for a while...


I can shed some light on what I think is happening further, as someone who pays close attention to the inner workings of Apple devices as a software developer... All Apple devices, since they transitioned to APFS a couple years ago update in a slightly different way than they did before, as I understand it. I've observed some of this since Big Sur brought the same update process from iOS/watchOS to the Mac where you can watch it if desired. In essence, the "preparing" stage is not merely "unpacking" the update archive that gets downloaded. It seems that what it really is doing is close to the full install, using the APFS feature to have space-shared separate volumes to build an entirely new system volume. On the Mac, this is now shown in the "sealed snapshot" that gets booted from, not the actual drive, if you look in Disk Utility. The same is happening on iOS and watchOS, and has for a lot longer. The issue us Series 3 users have is that this process requires the same amount of space for the update that the system itself takes up. The additional 2-something GB that is part of what the difference between 4.1 GB (capacity on my Watch) and the 7-something actual capacity is. The rest is, indeed, temporary system-generated files. With 2 copies of watchOS, our Watches have nearly nothing left. But, this is just my educated guess at what is going on, it may well not be accurate.


One way Apple may be able to "improve" this is to set aside that space ahead of time. But, Number 1: That again would reduce the visible capacity of our Watches to an undesirably puny amount. Number 2: That isn't always feasible, because Apple won't really know how big a new version of watchOS will be ahead of time, especially for the major updates each Fall. Extremely crappy user experience. I am starting to expect that Series 3 will not support watchOS 8 at all, largely due to this. But we'll have to see in June with the WWDC announcements. If it doesn't, then the poor folks who are buying these Watches today will be potentially quite upset.

Apple Watch says it has 4.2gb

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