They have a lot more errors because they pass a lot more data. The raw error rate (errors/bits passed) has stayed the same, typically 1e-6 or 1e-7. After ECC or channel correction, this is improved to 1e-12. After retries (drive tries to read the data again, multiple times if necessary, with offsets and other tweaks) the error rate improves to 1e-14 or 1e-15.
Only after all of the correction and retries are exhausted will the drive give up and report an error. This spec'd uncorrected (but detected) error rate is usually around 1e-18.
The spec'd uncorrected and undetected (i.e. the drive unknowingly sends incorrect data to the host without notifying it that there is an error) error rate is 1e-24.
Um, how about expanding on that and actually giving the size, so I don't have to RTFA?
Let the hive mind of Engadget get that for you.
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Only after all of the correction and retries are exhausted will the drive give up and report an error. This spec'd uncorrected (but detected) error rate is usually around 1e-18.
The spec'd uncorrected and undetected (i.e. the drive unknowingly sends incorrect data to the host without notifying it that there is an error) error rate is 1e-24.