Have you tried manually unmounting the the captive-ntfs mount after you are done writing? I know I have to unmount after using chntpw for blanking NT passwords. Just a thought...
I can't seem to get captive-NTFS working on Knoppix 3.7 or Helix 1.5.
Neither seem to want to work in 2.6 mode, but I can't get them to work on 2.4 either, although I get closer.
* On 2.4, it looks like it mounts fine. I see and can read the entire NTFS filesystem structure. I can also create a file on the NTFS mount and can then read it, but it is not persistant. If I reboot or try to access the NTFS drive directly, the file was never created on the NTFS drive.
No errors are given in my process.
* On 2.6, it gasps out some stuff about LUFS and doesn't complete.
I'm doing the following:
Loading Knoppix/Helix in 2.4 mode.
mkdir /mnt/dosc
captive-install-acquire (wait until it grabs the krnl and other files available on the distro),
hit skip, skip to get out of the acquirement process
I modify etc/group to have "captive:101"
I modify etc/gshadow to have "captive:*::"
useradd -gcaptive -d/var/lib/captive captive
mount -t captive-ntfs /dev/hde1 /mnt/dosc
I'm new to this stuff, so I'd appreciate any help any of you can offer.
Have you tried manually unmounting the the captive-ntfs mount after you are done writing? I know I have to unmount after using chntpw for blanking NT passwords. Just a thought...

Dell EMC PowerEdge R740 8 Bay Server w/ 32GB RAM 2x GOLD 6132 2x 1600W PSU H730p
$499.88
Dell Poweredge R630 2x Xeon E5-2680 v3 2.5ghz 24-Cores / 64gb / Raid / 2x 1Tb
$374.99
Dell EMC PowerEdge R440 Xeon silver 4215 2.5GHz 16 GB ram 2x 550W PSU No HDD
$275.00
Dell Poweredge R630 2x Xeon E5-2680 v3 2.5ghz 24-Core | HBA330 | No RAM or HDD
$169.99
Dell PowerEdge R720 Server 2× Xeon E5-2670 2.6GHz 126GB RAM RAID iDRAC
$350.00
Dell Poweredge R810 4x Xeon X7560 2.26ghz 32-Cores | 256GB | 3x Trays | H700
$289.99
Dell PowerEdge C4130 1U AI GPU Server | 2x E5-2680 v3 | 32gb Ram | 2x 1600W
$409.99
Dell PowerEdge R730XD 28 Core Server 2X Xeon E5-2680 V4 H730 32GB RAM No HDD
$378.93
Dell PowerEdge R730 Server 2x Xeon E5-2630 V4 64GB DDR4 2TB HDD Rackmount
$699.99
Dell PowerEdge R740 E38S001 Server E38S
$660.00