this post was submitted on 19 Jan 2025
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Bet even if you actually get the number of bytes from the raw block device, it won't match that advertised number.
My 1TB and 12TB drives are 1000204886016 and 12000138625024 bytes respectively. Looks like between the two I got a whole 343 MB for free!
If it's a SSD, it might. They are overprovisioned for wear-levelling, reducing write amplification, and remapping bad physical blocks.
I wouldn't trust one off of Wish, but any reputable consumer brand will be overpovisioned by 2-8% of the rated capacity. For 1 TB, it would take an entire 9% to match the rated capacity in base-2 data units instead of SI units, but enterprise drives might reach or exceed that figure.