These issues should cause no problems during the operation - but yes, it can have negative impact on the performance, if you see the error counter changing during normal usage and/or during intensive testing.
I'd suggest to use
1) Disk -> Short self test
2) Disk -> Extended self test
3) Disk -> Surface test -> Read test
tests in Hard Disk Sentinel. These are 100% safe for the stored information and can be started any time.
The Disk -> Surface test -> Read test may show a warning before starting (as because of the current running Windows and applications the disk can't be locked for exclusive use) but this is no problem - you can start the test anyway.
I'd suggest to use Report menu -> Send test report to developer option now and after the test(s) you perform. This way it is possible to examine not only the current complete status but the possible change of the counter.
> How is it possible for 187 the reported Uncorrectable errors to have a value when the 1 Raw read error rate is equal to the 195 Hardware ECC recovered?
This is completely normal for Seagate hard disks: the mentioned Raw read error rate and Hardware ECC recovered attributes does NOT indicate the actual number of errors (this is why they are not called error count).
Of course I can confirm that if there would be a real error with those attributes, Hard Disk Sentinel would surely
- report in the text description
- show the degradation health value
- it would be detected by Disk -> Short self test or Disk -> Extended self test
- the Disk -> Surface test -> Read test could not be completed without problems
If you are interested in further information about this, please check this forum topic:
(note that for Seagate drives, the "seek error rate" attribute may work the same way)
> You mentioned in a post earlier that there's a special firmware for the drives in the Lenovo laptops which uses this value for other purposes.
> What other purposes are we talking about here?
This is a good question - Seagate support may be able to answer it