added USB instructions to trouble shooting guide.

fixes #266

added solaris to supported os list.

docs/SUPPORTED_NAS_OS.md

@@ -1,4 +1,4 @@
-# Officially Supported NAS OS's
+# Officially Supported NAS/OS's
 
 These are the officially supported NAS OS's (with documentation and setup guides). Once a guide is created (
 in `docs/guides/` or elsewhere) it will be linked here.
@@ -14,4 +14,5 @@ in `docs/guides/` or elsewhere) it will be linked here.
 - [x] [PFSense](./INSTALL_UNRAID.md)
 - [x] QNAP
 - [x] [RockStor](https://rockstor.com/docs/interface/docker-based-rock-ons/scrutiny.html)
-
+- [ ] Solaris/OmniOS CE Support
+- [ ] Kubernetes

docs/TROUBLESHOOTING_DEVICE_COLLECTOR.md

@@ -113,11 +113,25 @@ instead of the block device (`/dev/nvme0n1`). See [#209](https://github.com/Anal
 
 ### ATA
 
+### USB Devices
+
+The following information is extracted from [#266](https://github.com/AnalogJ/scrutiny/issues/266)
+
+External HDDs support two modes of operation usb-storage (old, slower, stable) and uas (new, faster, sometimes unstable)
+. On some external HDDs, uas mode does not properly pass through SMART information, or even causes hardware issues, so
+it has been disabled by the kernel. No amount of smartctl parameters will fix this, as it is being rejected by the
+kernel. This is especially true with Seagate HDDs. One solution is to force these devices into usb-storage mode, which
+will incur some performance penalty, but may work well enough for you. More info:
+
+- https://smartmontools.org/wiki/Supported_USB-Devices
+- https://smartmontools.org/wiki/SAT-with-UAS-Linux
+- https://forums.raspberrypi.com/viewtopic.php?t=245931
+
 ### Exit Codes
 
 If you see an error message similar to `smartctl returned an error code (2) while processing /dev/sda`, this means that
-`smartctl` (not Scrutiny) exited with an error code. Scrutiny will attempt to print a helpful error message to help you debug,
-but you can look at the table (and associated links) below to debug `smartctl`. 
+`smartctl` (not Scrutiny) exited with an error code. Scrutiny will attempt to print a helpful error message to help you
+debug, but you can look at the table (and associated links) below to debug `smartctl`.
 
 > smartctl Return Values
 > The return values of smartctl are defined by a bitmask. If all is well with the disk, the return value (exit status) of