Update ssd-guide.md

Added clarity regarding risks of incomplete sanitization of disks due to intransparency of vendor tools.

ssd-guide.md

@@ -4,17 +4,18 @@
 1. Disclaimer & Warning
 2. Current Standard Commands for Sanitization
 3. Manufacturer and Vendor Support for Sanitization
-4. Advised Procedure for Sanitization of Drives
+4. Advised Procedure for Sanitization of SSD-Drives
 
 # Disclaimer & Warning
 The following information is given without any warranty and indicates best practices as of the writing of this content.
 All information should be validated for the precise manufacturer / vendor SKU you want to sanitize.
 Any sanitization process should be validated by comparing the information contained on the disk before and after sanitization assuring that the previously stored data has been destroyed.
-Given that most of the manufacturer tools available today are closed source, it is not possible to determine with security if the respective tool does or does not effectively verify the outcome of a sanitization.
+Given that most of the manufacturer tools (excluding nvme-cli as it was open sourced from the beginning) available today are closed source, it is not possible to determine with security if the respective tool does or does not effectively verify the outcome of a sanitization.
 To assure a successful sanitization it is highly recommended to compare the data contained on the disk before and after sanitization and use the manufacturer tool together with tools such as nwipe. 
 
-## Current Standard Commands for Sanitization
+# Current Standard Commands for Sanitization & Support by Manufacturers and Vendors
 
+## Current Standards
 All major block device interface standards contain optional block commands for sanitization. 
 Below are the standards listed for reference: 
 * [SATA ATA/ATAPI Sanitization Command according to ACS-3 Standard](https://people.freebsd.org/~imp/asiabsdcon2015/works/d2161r5-ATAATAPI_Command_Set_-_3.pdf);