Hi
I've got one of those (NTFS fmt, 2 partitions)
When scanning in MHDD or cloning (ddrescue) it runs at 100-60 MB/s.
While opened in Win or Ubuntu becomes very very slow - avg.transfer 18MB/s (copying big files - 600-1500 MB), seek time - infinity (opening partition takes 20-30 sec).
Any ideas ?

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data recovery Poland

When you are transferring at slow speed, how is the drive connected to the system and to what are you transferring to? How are you copying 1.5TB files from a 1TB drive?

File system transfers will always be slower than sector level transfers. If you have a lot of files on the drive, the MFT table could be large and take longer to load, as well.

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Luke
Recovery Force Data Recovery

@ lcoughey: I think it is 1.5Gb
@ laptokowiec: could be a firmware issue.

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Rescue IT Datarecovery service Sweden
Rescue IT Dataräddning Göteborg AB
http://www.rescue-it.se

It's 1,5GB like mr_spokk noticed.
It's connected through sata.

While copying it looks like it transfers some amount of data then stops/waits (for a few seconds) and again transfers next portion

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data recovery Poland

I would suspect firmware issue as well

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

Have they (WD) released any firmware upgrade like Seagate for .11 ?

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data recovery Poland

Firmware, heads or logic board failure. Or a blended problem.

I would check each separately and also on different environment.

P.S. NTFS/MFT is not the culprit as the same problem comes out while scanning with MHDD tht is FS independent !