What do people have with percentages when guessing how big the OS is? That's not how it works. If you have a 1TB drive and the OS needs 7% than the OS does not need 7% on a 2TB drive.1 TB = 931 GiB, leaving about 70 GB (931- 862) reserved for OS.. or 7% of the original amount of storage.
If we apply the same logic to the 825 GB we end up at;
825 GB = 768 GiB. Subtracting the same 7%, we end up at 714 GB available space. But of course, this is guesswork.
175 GB is plausible
1. Sony needs to reserve space for future updates
2. For Updates about 4 times the space of the real OS size is needed: 1x OS, 1x OS Download, 1x OS Backup, 1x decompressed OS files, ...
3. Maybe sony reserved space for overprovisioning which is always a good idea with an ssd
Well when you think back, even than the 500GB HDDs were really tiny. ~595-605 GiB that is now remaining is not much.650GB that's definitely an upgrade over the launch model PS4 in 2013 which had less than 420gb of usable space in the HDD
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