Securely remove files from an NTFS drive?

I have an external NTFS drive, and I want to securely remove some files from it. SRM is no longer available in Sierra. I tried to install SRM with Homebrew, and did install it successfully, but when I apply the command to an external drive I get an error: "Segmentation fault: 11" What can I do?

I do not use software like Paragon NTFS to enable write on the drive. Instead I do this in Terminal:

sudo nano /etc/fstab

Add the following line to nano, replacing “NAME” with the label of your NTFS drive:

LABEL=NAME none ntfs rw,auto,nobrowse

Ctrl+O then the Enter key, then Ctrl+X to close nano.

Solution 1:

Use gshred. Install homebrew if not installed from www.brew.sh. Then do

brew install coreutils

to remove files, do

gshred -u <file1> <file2>

Solution 2:

You can use rm with the -P option which will overwrite the file prior to deleting it.

From the man page:

Overwrite regular files before deleting them. Files are overwritten three times, first with the byte pattern 0xff, then 0x00, and then 0xff again, before they are deleted

It's not a DoD 7 pass wipe, but fairly secure nonetheless. So, your command would be:

rm -P /path/to/foo.bar

And it will do a triple overwrite before removal.