5MB/s even for sequential transfers sounds too severe for thermal throttling, unless a temperature sensor failed in just the right way to convince the drive to activate its last-ditch throttling mechanism before simply shutting down.
More likely, you were experiencing repeated ECC failures and read retries on every access. Since you ruled out a bad cable by also running it in a dock, I'm guessing you had a premature failure of a large chunk of flash, possibly an entire die (though a lot of drives especially at lower capacities don't have enough over-provisioning to do erasure coding to protect against a full die failure).
- Constructed with fewest number of nand chips possible, and using bottom of the barrel shit like 64L Intel QLC
- Easily overheating DRAMless controller
(eg. SM225*XT hitting 70+C at the slightest load)
- Tucked in a heat trap plastic case
- pSLC cache is always almost-full (because for some reason entry level controllers always choose to do that), which is quickly filled after a not-so-long run of Windows update
Combine all these in a single product (like ADATA often does in its entry level SATA), and 5 MB/s sounds actually fast :)
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5MB/s even for sequential transfers sounds too severe for thermal throttling, unless a temperature sensor failed in just the right way to convince the drive to activate its last-ditch throttling mechanism before simply shutting down.
More likely, you were experiencing repeated ECC failures and read retries on every access. Since you ruled out a bad cable by also running it in a dock, I'm guessing you had a premature failure of a large chunk of flash, possibly an entire die (though a lot of drives especially at lower capacities don't have enough over-provisioning to do erasure coding to protect against a full die failure).
It sounds like a regular day.
Probably combination of:
- Constructed with fewest number of nand chips possible, and using bottom of the barrel shit like 64L Intel QLC
- Easily overheating DRAMless controller (eg. SM225*XT hitting 70+C at the slightest load)
- Tucked in a heat trap plastic case
- pSLC cache is always almost-full (because for some reason entry level controllers always choose to do that), which is quickly filled after a not-so-long run of Windows update
Combine all these in a single product (like ADATA often does in its entry level SATA), and 5 MB/s sounds actually fast :)