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Whenever I connect an external USB hard drive with an NTFS partition to my Ubuntu driven netbook all partitions are lost for Windows machines and listed as RAW.

Sequence:
⠀USB hard drive with NTFS partition(s) and data
⠀Connecting USB hard drive to Ubuntu.
⠀All partitions are being recognized, icons appearing on desktop, I can copy, read and write.
⠀Right-click on the icon(s), choose to safely unmount.
⠀After connecting to a Windows computer, OS is asking to format partitions and Windows Disk Management shows them as RAW.

I checked with three hard drives in a row on two separate USB adapters.

Why is this happening and how to prevent it?

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After your USB drive is shown as "raw" in Windows, can you still reconnect it using Ubuntu and access all your data? Or is it then lost on Ubuntu too? –  Malte Skoruppa Mar 25 at 14:28
    
I suggest that you perform a test of the stability of your USB port by using the Startup Disk Creator application to make an Ubuntu USB Startup Disk on a pen drive, set the BIOS boot device priority to have USB-HDD come first in the boot sequence, then boot to the startup disk, and check if you can run desktop applications, browse the web with Firefox, etc. without any problems from the Startup Disk on your pen drive. –  karel Mar 25 at 14:30
    
I wasn't able to mount drives again. Under windows I was able to recover data by running 'chkdsk /f', I have recovered all data but files from root went to 'found' directory. After running checkdisk on all drives and partitions I was unable to recreate issue on any of the 3 usb ports of my Ubuntu netbook. Looking at chkdsk output it seems that on every occasion MFT has been damaged, not partition table. I'll try this stability test Karel suggested. I am trying to build a lightweight solution to store my pictures during holiday away from civilisation. –  PiKor Mar 25 at 18:33
    
issue reoccured, if I mount (auto) a usb hdd and make any write operation (delete, move etc) the file table is lost in windows until chkdsk is used, Ive checked this with all ports –  PiKor Mar 26 at 22:34
    
and I am also under impression that damage is done once the disk is connected to windows, if is used solely with linux all is OK even if partition is ntfs –  PiKor Mar 26 at 22:50

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