Blocks, sectors, and clusters don't seem to get used in the industry in a very consistent manner. For example what ext2 calls blocks, FAT calls clusters.
Do this from an Administrative command prompt.
fsutil fsinfo ntfsinfo c:
SSDs do use a 4K sector size, but you'll see that the firmware handily lies and presents a 512 byte sector size
You'll also see that the cluster size is 4096, which is what we're most interested in as that represents the smallest unit of writes that can occur at the filesystem level. It also happens to match the real sector size of the disk.
That doesn't mean that 4K is written for every transaction, but it does mean that if the transaction is smaller than 4K it will leave behind slack space
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