First, HS-DHGL is pretty old and according to our wiki,
You won't have any luck with a disk formatted with a
Windows only filesystem like NTFS.
If you don't have any files bigger than 4 GB, you can
use FAT32 and do a simple copy of your valuable data.
If there are files bigger than 4 GB, you have to use a
"known" Linux filesystem which is "readable" by Windows
via a dedicated filesystem driver.
The "only" working Linux filesystem driver for Windows
I am aware of, is ExtFs; so ext2 or ext3 (NOT ext4)
should be the filesystem of your choice for this task,
if you want to do the copy via the USB interface.
If you accept a longer transfer time, attach the disk to
a Windows PC and copy via file explorer.
No need to change from NTFS to any other filesystem
Please do not use private mail (PN/M) to ask questions. Use the proper forum instead. (me)
If there is no verified backup of a dataset, the dataset, by definition, is unimportant. (c't 2012)
RAID (no matter which level) never ever substitutes a backup. (me)