TerraMaster Forum

Bought D8hybrid and two iron wolf pro 16tb drives a week ago, few days back it arrived, so after setting it up as hdd enclosure (single, default mode) i started copying files from pc to hdd's via Teracopy v4 software.
Almost every file ended up with checksum mismatch, data isnt corrupted to degree that its unusable, yet it is corrupted.

I spend hours trying to understand what is causing it, updating drivers, changing cables, ports, slotting hdd's in different places and so on, sweated on search engine both in forum and global web trying to find the cause
Attempted to transfer with fastcopy and robocopy, both yielded same mismatch ridden results.

Few hours ago i did my last attempt, and no surprise, i get same results while trying to transfer, once again teracopy spends 10mins transfering and verifying files just to show me that 99% of files have checksum error.

So i decided to do one of simpliest things, that i didnt do, before reflashing bios and running memtests.

I eject drives, i take the usb-c cable out of D8 and plug it into cheap HDD dock i had in drawer, i take one of hdd's and slot it in, attempt same transfer sequence as with every test, no transfer errors whatsoever, everything i copy to both drives while using few euro worth hdd dock end up perfect, its using same exact teramaster cable i didnt even unpluged it from pc side, nor i restarted or ended the windows session.

Not sure what to do here, should i just bin this thing? Or maybe im just doing something wrong?

dimigi wrote: ↑28 May 2025, 03:45

Hi, it is recommended backing up data by placing two hard drives in the HDD1/2 slot and resetting the partition file format using the RESET button, and then verifying.

MikeZhang wrote: ↑28 May 2025, 09:07

dimigi wrote: ↑28 May 2025, 03:45

Hi, it is recommended backing up data by placing two hard drives in the HDD1/2 slot and resetting the partition file format using the RESET button, and then verifying.

Did that, same result, tried with new WD red drives too, same result of corrupted files. 10k transfers end up with minimum of 100 files that have hash mismatch, which is quite low yet im sure if i keep transfering i end up with ops that have 9k corruptions in 10k transfer, same as before reset.

Got third bay delivered today, it produces no mismatch errors, so my software, cable, and ports definitely not an issue.

Hybrid D8 is only one doing that, i been told teramaster have best DAS so im confused on what is going on here with single drive mode, em i doing smtg wrong? it seems not.

I highly advice anyone using d8 as hdd enclosure without raid's to verify checksums.

Im gonna pack it up now, still have few days left to fit into amazon.de policy. Pretty sure it be faster this way than going thru warranty.

Gonna order again and update with results.

@dimigi, any status update? Does the new D8 hybrid work, or does it have the same issue?

TheBestPessimist wrote: ↑23 Mar 2026, 19:01 @dimigi, any status update? Does the new D8 hybrid work, or does it have the same issue?

Hello, the D8 hybrid is functioning normally. If the hash values do not match when transferring files, this may be related to the file format you are using. We have not encountered this issue in our testing, so please feel free to use it with confidence.