this post was submitted on 28 Jul 2023
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Technically there is a reduction in performance as you fill the drive but, as far as I know, it's a pretty small difference in modern SSDs and you'll probably never notice it in real world usage. It might show up in synthetic benchmarks or server/database applications that involve moving huge amounts of data constantly.
An issue you may encounter in the real world is SLC cache saturation when writing data. Flash memory can basically kind of come in high density, or high speed, but not both. You trade off one for the other. Most SSDs have a mix of both, allowing rapid writes to the "fast" SLC memory, which will then get transferred to the "slow" TLC/QLC/PLC/etc. memory over time. Depending on the SSD model and how the manufacturer configured things, it's possible that if you're writing hundreds of gigabytes in one operation you'll completely fill the fast memory and your write speeds will plummet dramatically until the transfer is finished.