x200_external.md: Clarify Intel Turbo Memory

The driver is free software and contains no code to load any nonfree
firmware, so if it has been blacklisted it might not be because
of freedom issues, but probably because of reliability issues.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

1 files changed, 14 insertions, 6 deletions

diff --git a/docs/install/x200_external.md b/docs/install/x200_external.md
index 327d8b88..98577028 100644
--- a/docs/install/x200_external.md
+++ b/docs/install/x200_external.md
@@ -216,12 +216,20 @@ Intel Turbo Memory
 ==================
 
 Some X200 devices were sold with Intel Turbo Memory installed in the top-most
-mini PCI-e slot. This has been [shown to be
-ineffective](http://www.anandtech.com/show/2252) at disk caching or battery
-saving in most use cases. While there are [Linux
-drivers](https://github.com/yarrick/turbomem) available, it is blacklisted in
-at least GNU+Trisquel, and possibly other free operating systems. It should
-probably be removed.
+mini PCI-e slot.
+
+If you have one installed, you should probably remove it as it mostly likely
+brings no benefits, while having many issues:
+-  It has been [shown to be
+   ineffective](http://www.anandtech.com/show/2252) at disk caching or battery
+   saving in most use cases. Having it installed might lead to more
+   battery consumption.
+-  Using it will most likely lead to data loss because with its
+   [driver](https://github.com/yarrick/turbomem),
+   "data cannot be written/read back reliably". The driver development
+   has also stopped.
+-  It might also be a security risk as it may have access to the system
+   RAM through the PCIe bus.
 
 Memory
 ======