On 3/3/25 02:03, Dan Purgert wrote:
On Mar 02, 2025, Eben King wrote:
[...]
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED
WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 082 064 006 Pre-fail
Always - 146369262
146 million read-errors.
7 Seek_Error_Rate 0x000f 084 060 045 Pre-fail
Always - 232382570
230 million seek errors
9 Power_On_Hours 0x0032 093 093 000 Old_age
Always - 6346h+20m+46.297s
~9 years on-time
6346 hours / 24 hours/day = 264.42 days
6346 hours / 24 hours/day / 365.2425 days/year = 0.72395 years
195 Hardware_ECC_Recovered 0x001a 082 064 000 Old_age
Always - 146369262
Well, at least those read errors were all corrected ;)
None of the first three bits are absolute proof that the drive is going,
but they're certainly cause for suspicion.
I have been watching my HDD's and SSD's with smartctl(8) intermittently
over the years, and am still confused. HDD's with "bad" statistics can
still work, while failed drives can produce statistics above the "bad"
drive values (!). It's a conundrum.
I have always wondered if the decimal numbers in the smartctl(8)
"RAW_VALUE" column are actual event counts, or a decimal representation
of some binary bit field whose correct interpretation only the
manufacturer knows (?).
I typically look at the "VALUE" column, as it usually represents an
integer percentage that starts at 100 (%) and diminishes towards 0 (%)
as the drive degrades. That said, I have seen starting values of 120,
200, and possibly 255 (?). So, again, only the manufacturer knows.
I own about a dozen and a half 2.5" SSD's, and one M.2 PCIe NVMe SSD.
None have failed (yet). AIUI, SDD's go from working to choppy to brick
in rapid succession.
I awoke one night to the smell of fried electronics. I quickly found
the source -- a USB flash drive connected to a MacBook Pro as a Time
Machine backup drive. I did a little testing on a Debian machine the
next day. The drive was marginally readable at a very slow transfer
rate (timeouts?). I did not want to damage my computer, so I smashed
the USB flash drive and recycled the husk.
David
