Making sense of the SMART indicators for NVMe SSDs, including all recent models fitted by Apple to Macs.
capacity
The life of an SSD should be more predictable than a hard disk. All you need is its TBW, and the total amount of data written to it so far.
Confused by this on APFS? So you should be, as it’s complicated by features like snapshots, sparse files, and the file system itself. There’s no single figure.
I claimed (from a guess) that there might be 0.8 GB of xattrs in my Home folder. I was wildly wrong: there are actually over 3.8 GB. Here’s how xattrs are distributed.
How many bytes are there in a kilobyte, and have you heard of a kibibyte?
The Eclectic Light Company 