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Update README.md - A warning

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A warning paragraph for those that are unsure what disk erasure actually is and what the consequences can be.
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@@ -40,6 +40,9 @@ Shredos includes the latest Nwipe master, Smartmontools, a hexeditor [hexedit](h
ShredOS boots very quickly and depending upon the host system can boot in as little as 2 seconds (typically 4 to 6 seconds) on modern hardware, while on an old Pentium4 may take 40+ seconds. Nwipe automatically starts in GUI mode and will list the disks present on the host system. In fact, Nwipe can launch so fast that the USB devices have not yet initialised so the first time nwipe appears it may not show any USB drives. If you then use Control-C to exit and restart nwipe, you should now see any attached USB devices. You can then select the methods by which you want to securely erase the disk/s. Nwipe is able to simultanuosly wipe multiple disks using a threaded software architecture. I have simultaneously wiped 28 loop devices in tests and know of instances where it's been used to wipe upwards of 10 drives on a system.
## What do I do after I've erased everything on my disk? A warning to users that don't really understand what disk erasure is!
First my apologies to everybody that knows exactly what they are doing when wiping disks. This paragraph is not for you. Now I've seen comments on forums, yes DBAN amongst others, where users are puzzled that their forensically erased disk seems to not be seen by their OS or even worse, won't boot after they have just erased it!... Well that's because DBAN/DWIPE and SHREDOS/NWIPE have removed everything, absolutely everything, the operating system is gone, all your data is gone and will never to be recovered from the disk. Usually the only thing left is a whole load of zeros which are good for nothing. If you use software like this you are expected to know how to format a disk with a partition & filesystem or install a new operating system such as Linux or Windows, unless of course you are just disposing of, or reselling the disk. This is very destructive software in terms of anything that resides on the hard disk that you are about to wipe. This is a message to just let you know how dangerous this software can be when used incorrectly or without an understanding of what needs to be done after you have used it. If you are reasonably happy that you know what you are doing then I hope this software does it's job and is useful to you.
## Nwipe's erasure methods
For an upto date list of supported wipe methods see the [nwipe](https://github.com/martijnvanbrummelen/nwipe) page.
* Quick erase - Fills the device with zeros, one round only.