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[Solved] HD Tune Health Test: B8 Unknown Attribute Failed - Should I Worry? Error Analysis

sebamjuzik 18261 13
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  • #1 17383830
    sebamjuzik
    Level 10  
    Posts: 188
    Rate: 30
    Hello, the HD Tune Health test showed the error below, is this something serious or do I need to worry?

    HD Tune Health Test: B8 Unknown Attribute Failed - Should I Worry? Error Analysis
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    #3 17384941
    dt1
    Admin of Computers group
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    This is an End to End error. His speech is nothing good. This error occurs when there is a problem with the disk cache. Unfortunately, I don't know how to check the efficiency of the disk cache.

    In general, a disk with a defective cache memory can be very dangerous - such a defect can lead to corruption of data written on the disk (ie it may be written with corruption and impossible to read correctly).

    But maybe the problem is elsewhere. Parameter B7 is SATA Downshifts. The disk passed a lot of them (this means that it switched to the lower SATA generation in the course of work to be able to work properly). This means that there may be something wrong with the SATA cable, it is worth replacing it as a preventive measure.

    Unfortunately, you found the rest of the table invalid, so it's hard to judge the rest of the parameters.

    Based only on this data, it is worth replacing the SATA tape with a decent one and observe whether the B7 and B8 parameters (RAW values, i.e. the Data column in HDTune) will not increase.
  • #4 17385106
    sebamjuzik
    Level 10  
    Posts: 188
    Rate: 30
    This is the second part of the view:

    HD Tune Health Test: B8 Unknown Attribute Failed - Should I Worry? Error Analysis

    I put the drive in the external usb pocket (Digitus 3.0) and here the test looks different:

    HD Tune Health Test: B8 Unknown Attribute Failed - Should I Worry? Error Analysis

    Changing the sata tape will be possible only in a few days, I will post the info right away.
    And one more thing: earlier there was a 400GB disk in this computer, which was very loud, so I replaced it, but there were no errors on it, although it was connected with the same tape:

    HD Tune Health Test: B8 Unknown Attribute Failed - Should I Worry? Error Analysis
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    #5 17385204
    safbot1st
    Level 43  
    Posts: 21951
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    You really don't see those sliders on the right? We have truncated SMART from ST.
    One thing you should know, since you've insisted on HDtune do SMART - it incorrectly highlights bugs - it's such an open secret.
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    #6 17385652
    dt1
    Admin of Computers group
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    sebamjuzik wrote:
    This is the second part of the view:

    This beyond what I wrote, I have no more comments. Replace the tape with a decent one, watch if the value in the column data for B7, B8 and C7 does not increase.

    sebamjuzik wrote:
    I put the drive in the external usb pocket (Digitus 3.0) and here the test looks different:

    It has to look different because it's a different drive. In the case of this WD there is nothing to complain about too much.

    sebamjuzik wrote:
    earlier there was a 400GB disk in this computer, which was very loud, so I replaced it, but there were no errors on it, although it was connected with the same tape

    It doesn't change anything.
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  • #7 17385809
    sebamjuzik
    Level 10  
    Posts: 188
    Rate: 30
    dt1 wrote:
    sebamjuzik wrote:
    I put the drive in the external usb pocket (Digitus 3.0) and here the test looks different:

    It has to look different because it's a different drive. In the case of this WD there is nothing to complain about too much.


    dt1 - in the pocket I put the same disk with errors on the tape, unless the pocket changes the shape of things ...
  • #8 17385850
    dt1
    Admin of Computers group
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    The disk with errors from the first post is Seagate ST3250318AS, 250GB.
    The drive that was described as the in-pocket drive was Western Digital WD10EURX, 1000GB.

    The identification is correct, the pocket does not change it, just two different disks were checked.
  • #9 17386702
    sebamjuzik
    Level 10  
    Posts: 188
    Rate: 30
    dt1 wrote:
    The disk with errors from the first post is Seagate ST3250318AS, 250GB.
    The drive that was described as the in-pocket drive was Western Digital WD10EURX, 1000GB.

    The identification is correct, the pocket does not change it, just two different disks were checked.


    Oh shit actually ... I did not indicate the correct disk in HD Tune ... There was the one with errors in my pocket and I took a screenshot of my PC eh ....
  • #10 17396939
    sebamjuzik
    Level 10  
    Posts: 188
    Rate: 30
    Hello, changing the tape did not give anything, the error still appears, I did a test with CrystalDiskInfo, the readings are the same:

    HD Tune Health Test: B8 Unknown Attribute Failed - Should I Worry? Error Analysis
  • #11 17396956
    dt1
    Admin of Computers group
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    Changing the tape probably did a lot. Errors that have been accrued will not suddenly be cleared after changing the tape. However, no new errors appeared, the B7 / B8 / C7 values are the same as a week ago, so the situation does not worsen.
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  • #12 17397034
    sebamjuzik
    Level 10  
    Posts: 188
    Rate: 30
    dt1 wrote:
    Changing the tape probably did a lot. Errors that have been accrued will not suddenly be cleared after changing the tape. However, no new errors appeared, the B7 / B8 / C7 values are the same as a week ago, so the situation does not worsen.


    Probably right :) Now I have two questions: is it dangerous, however, and should a drive that has been behind it over 13,000 hours be replaced even more?
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    #13 17397044
    dt1
    Admin of Computers group
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    No drive, even a new one, is a device that should be trusted in particular. Back up your important stuff, whether to a 13,000-hour drive or a new drive.

    In addition, the new drives are faster, but their failure rate also seems to be higher than that of the old models.

    Honestly, if the drive is okay with no problems, it doesn't panic too much. You can install SMART status monitoring software periodically and inform you if something starts happening. I would most likely do that.
  • #14 17397047
    sebamjuzik
    Level 10  
    Posts: 188
    Rate: 30
    Oki thanks for your valuable advice ;)

Topic summary

✨ The HD Tune Health test indicated a B8 Unknown Attribute failure, raising concerns about potential disk cache issues. Users suggested checking the complete SMART data using CrystalDiskInfo and noted that the B8 error could signify a serious problem, possibly leading to data corruption. The B7 parameter, indicating SATA downshifts, was also highlighted, suggesting a possible issue with the SATA cable. Despite changing the SATA cable, the error persisted, but no new errors appeared, indicating that the situation did not worsen. Users advised regular backups and monitoring the SMART status, especially given the drive's extensive usage of over 13,000 hours.
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FAQ

TL;DR: If SMART B8 shows but B7/B8/C7 have 0 increase over 7 days and "no new errors appeared," the situation isn’t worsening; continue monitoring. [Elektroda, dt1, post #17396956]

Why it matters: For PC users and repair techs troubleshooting SMART B8/B7 flags on Seagate/WD drives, this FAQ clarifies risks, tools, and next steps.

Quick Facts

What does SMART B8 "End-to-End error" actually mean?

B8 flags an End‑to‑End verification failure. It indicates a problem with the drive’s cache or its internal data checking. Such defects can cause inconsistent data to be written to media. Treat B8 as a reliability warning and investigate before heavy use. [Elektroda, dt1, post #17384941]

Is a B8 failure serious—should I worry about data loss?

Yes. The expert noted cache‑related B8 faults “can lead to corruption of data.” Consider the drive risky for new writes if B8 rises. Minimize write activity until you confirm the counts stop increasing. [Elektroda, dt1, post #17384941]

How do I troubleshoot B8/B7/C7 errors?

Try this quick process:
  1. Replace the SATA cable with a known‑good, quality cable.
  2. Read the full SMART table and note RAW counts for B7, B8, C7.
  3. Monitor those counts; they should not increase over time. [Elektroda, dt1, post #17385652]

What is SMART B7 "SATA Downshifts" and what causes it?

B7 logs times the drive downshifted to a lower SATA generation to maintain communication. Frequent downshifts hint at signal issues or marginal cabling. Replace the SATA cable, then watch for new increments after the change. [Elektroda, dt1, post #17384941]

Should I replace the SATA cable if I see B7 or C7 counts?

Yes. Replace the cable with a decent one, then recheck SMART. Continue monitoring B7 and C7 RAW values to ensure they do not increase after replacement. [Elektroda, dt1, post #17385652]

After changing the cable, will SMART error counts reset?

No. Existing counts remain. The helper explained accrued errors will not suddenly clear after replacing the cable. Track from your new baseline going forward. [Elektroda, dt1, post #17396956]

My B7/B8/C7 counts are unchanged after a week—is that good?

Yes. The report showed 0 increase over seven days; “no new errors appeared,” so the situation isn’t worsening. Keep periodic checks to confirm continued stability. [Elektroda, dt1, post #17396956]

Can HD Tune misreport SMART or flag "Unknown attribute B8"?

Yes. A contributor warned HD Tune “incorrectly highlights bugs.” Treat its alerts as preliminary. Cross‑check with another SMART utility before making replacement decisions. [Elektroda, safbot1st, post #17385204]

Which tool should I use for a complete SMART readout?

Use CrystalDiskInfo and expand the window so every attribute is visible. Share the full table when requesting analysis. [Elektroda, RADU23, post #17384891]

My USB enclosure test showed different results—why?

Verify you selected the same physical drive by model string. In the thread, two different disks were tested, causing mismatched results. Enclosures do not change identification strings. [Elektroda, dt1, post #17385850]

Is the WD10EURX drive healthy compared to the Seagate ST3250318AS?

The reviewer said the WD10EURX SMART “has nothing to complain about.” Based on those screenshots, it looked OK. Always confirm with a complete SMART capture. [Elektroda, dt1, post #17385652]

Should I replace a drive with high power‑on hours?

Back up and monitor SMART rather than panic. “No drive, even a new one, is a device that should be trusted in particular.” Enable monitoring and act if attributes worsen. [Elektroda, dt1, post #17397044]

Which SMART attributes should I watch going forward?

Watch RAW counts for B7 (SATA Downshifts), B8 (End‑to‑End), and C7 (CRC errors). Investigate promptly if any start increasing. [Elektroda, dt1, post #17385652]

Could a defective cache actually corrupt new writes?

Yes. The engineer cautioned a defective cache “can lead to corruption of data.” Avoid critical writes until you verify counts remain stable. [Elektroda, dt1, post #17384941]

How can I confirm I selected the right disk in SMART tools?

Check model and capacity match the intended drive. Example from the thread: ST3250318AS (250GB) vs WD10EURX (1000GB). Misselection explains differing SMART screenshots. [Elektroda, dt1, post #17385850]
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