TeraCopy4 RC, error in multi-target free space check

In reviewing the postings prior to creating this ticket, I did not see this issue yet described. If this is a know bug, please ignore.]

Thank you for the work progress to date!

[BTW: Also—many thanks for the ADS xxHash3! This will be very useful. Waiting to release 4.0 to file the purchase order for my next set of licensed copies!]

TEST SETUP:

Windows 10v22H2, CU 20205.04b.

Windows 10 [Version 10.0.19045.5737]

Two Target HDD’s, each with 7.4TB of free space. [NTFS, 4KB Cluster size, Fresh Format. WDC external, 8TB USB3 HDD]

Source HDD, 16TB Seagate SATA HDD, (NTFS, 4KB Cluster size), with a source directory tree to be copied containing 4.5TB of files.

Copy from source to both targets. [Initiated via a RightClick→TeraCopy from DirectoryOpus 13.14],

If “Check for free space” is set, then the operation fails with the error: Insufficient free space, need 1.6TB. It would appear the the free space check routine is adding together the allocation of both destination copies and applying this value to the free space available on the Target file systems. [4.5TB + 4.5TB = 9.0TB. 9.0TB - 7.4TB = 1.6TB]

The operation completes successfully if the “Check Free Space” option is disabled.