CVODON,
Not to mix apples and oranges, but I would have at least two 8G usb drives for the Navigation map updates. Mine are both 16G, they are relatively cheap now.
And i have one USB, 16G for the Boom Box Infotainment updates.
I use one for the Boom Box software updates that we get for free about every 6 months. As you know, that is a different process and downloading to the computer and then un zipping, extracting and then putting (moving/copying that file to the USB disk. If you copy that file to the root directory of a clean, (a usb without any files on it) the USB you will always have the most current version on your computer as a backup copy and if you had a problem with the USB drive you could just copy it again to another USB without downloading it again.
Now for the NAV update, the subject of this thread, I used a second USB drive, (i have two for NAV update USB devices), the old one has my current maps on them, the maps that are currently on the bike, and the new USB will have newest updates on them. Remember we don't download the NAV updates to the computer hard drive, like we do for the the Boom Software, we download it directly to the USB.
So if there is a problem doing the NAV, map download or update procedure, you will still have the other USB with your current maps.
So when it is time for my 3rd and final free update, I will use the old '14 map USB and keep the '15 update USB as my backup file.
Before using the '14 map USB, I will delete all and any files on the USB and start again with a clean, no file USB for the download.
I have a slow internet and it took approximately 2.5 hours for the download and then about and hour to install it on the bike.
I don't know that much about the NAVI software, but if I had an internet interruption, and the download failed, I would review the USB for any files, delete them and start over.
If I had a problem with installing the software on the bike, and didn't have time to go thru another download attempt I would still have a USB with last years maps to fall back on.
Bottom line, doing either update, Boom Box or Nav update, always start with a clean USB drive and always have the last software backup.
I installed mine this morning, no issues.
And thanks again to all for listing the procedure steps, and the video. Made this update easy.