Windows 10: USB flash drive --assign drive letter back to dynamic from static Solved

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  1.    18 Dec 2017 #41

    Bree said: View Post
    Yes, the MBR table starts at the first sector of the drive and contains the information describing (up to) four partitions that are on the rest of the drive - start address, sector size etc. If you create an MBR with no info in it, then Disk Management shows it all as 'unallocated'. That's what diskpart's 'convert mbr' command does, it creates an empty mbr. The mbr is essential, but it is not the partition, it is the index to the partitions.

    UEFI's gpt uses a completely different way to index the partitions, that's all.
    Thanks Bree for all your help in getting me to what was the actual root cause of the problem..the GPT partition table. I would never have sussed that out. You've been an absolute star and have guided me patiently all the way. I now have a much better understanding. Many Thanks
      My ComputerSystem Spec

  2.    18 Dec 2017 #42

    I just wanted to say Thanks to Bree, Caledon Ken and Fdegrove for all of your help in this thread.. You've all been so helpful with your advice. You guys, along with other knowledgeable members on this site, have also helped me with several other issues in the past . TenForums is always the first place I come to whenever I'm having problems. I'd be lost without you guys and would be left tearing my hair out (whats left of it). Many Thanks..Your assistance, as always, is much appreciated
      My ComputerSystem Spec

  3. Bree's Avatar
    Posts : 8,795
    10 Home x64 (1809) (10 Pro on 2nd pc)
       18 Dec 2017 #43

    sportsfan148 said: View Post
    TenForums is always the first place I come to whenever I'm having problems. I'd be lost without you guys and would be left tearing my hair out (whats left of it). Many Thanks..Your assistance, as always, is much appreciated
    You're welcome, any time.

    (I don't have much hair left either, but it's not your fault. I lost it long before finding TenForums )
      My ComputersSystem Spec

  4.    20 Dec 2017 #44

    Bree said: View Post
    Option Four of that tutorial is basically doing the same thing as I did. The difference is that step 6. (convert mbr) just creates an empty mbr table, so step 7. is needed to create a partition in it and format it. My CREATE PARTITION PRIMARY command creates the mbr table and the partition in one go, but I then need a second command to format it. Two ways to skin a cat, both work.
    Hi Bree, I just wanted to let you know that I followed the instructions exactly and changed from GPT back to MBR. I ran the Media Creation Tool again to create a bootable USB flash drive. I got that exact screen popping up again at 50% whilst creating the media. This time the error message was slightly different Error 0x80042405-0xA001A. It looks like I'm going to have to give up on the Media Creation Tool and use Rufus instead to create the bootable USB after downloading the ISO again with the Media Creation Tool
      My ComputerSystem Spec

  5.    20 Dec 2017 #45

    Hi,

    Why not use MCT to create an ISO file. You can then use it as many times as you like to create installation media without having to download anything.

    Further to the error code :

    https://answers.microsoft.com/en-us/...ea5b7d1?auth=1

    and:

    https://answers.microsoft.com/en-us/...7-ca9c4f17e74f

    Cheers,
      My ComputersSystem Spec

  6. Caledon Ken's Avatar
    Posts : 10,553
    Windows 10 Pro x64 Build 1803
       20 Dec 2017 #46

    Just for my peace of mind. This is a fresh copy of the MCT tool, correct?

    One hit suggested using Disk Cleanup and cleaning up all old system files.

    I searched your error code and other have this error, recently. Had to laugh. On the MS forum a community moderator suggested using Rufus instead of getting down to root cause with MS's tool.


    Ken
      My ComputerSystem Spec

  7.    20 Dec 2017 #47

    fdegrove said: View Post
    Hi,

    Why not use MCT to create an ISO file. You can then use it as many times as you like to create installation media without having to download anything.

    Further to the error code :

    https://answers.microsoft.com/en-us/...ea5b7d1?auth=1

    and:

    https://answers.microsoft.com/en-us/...7-ca9c4f17e74f

    Cheers,
    Yeah that's what I'm going to do mate. Having just wasted a couple of days messing about trying to get to the bottom of the problem. I plan to use Media Creation Tool to just download the ISO. Then download Rufus to create the bootable USB from the downloaded ISO. That's what you mean isn't it?
    Do you think I need to remove any remains of the Media Creation Tool attempts from my hard disc? I wouldn't have a clue where to look though.
    Also, should I doing anything with my USB flash drive to prepare it before using Rufus ...reformat it or something more? Or will Rufus sort it out?
    As to your two links you've posted on the error code. I googled the error code and theres loads of people having the same issues.
      My ComputerSystem Spec

  8.    20 Dec 2017 #48

    Caledon Ken said: View Post
    Just for my peace of mind. This is a fresh copy of the MCT tool, correct?

    One hit suggested using Disk Cleanup and cleaning up all old system files.

    I searched your error code and other have this error, recently. Had to laugh. On the MS forum a community moderator suggested using Rufus instead of getting down to root cause with MS's tool.


    Ken
    Hi Ken. Yeah its a newly downloaded Media Creation Tool this morning. The USB flash drive is 16gb so size isn't the issue either. Do you think I need to do anything with files on my PC or prepare the USB flash drive in any way before using Rufus? I'm going to use the Media Creation Tool to download the ISO and then use Rufus to create the bootable USB flash drive using the downloaded ISO.

    Yeah, Ive seen loads of people having the same problem. I saw that moderators post too suggesting Rufus. It definitely appears to be Microsoft who need to get the Media Creation Tool sorted out. It looks like its been going on for a while
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  9. Bree's Avatar
    Posts : 8,795
    10 Home x64 (1809) (10 Pro on 2nd pc)
       20 Dec 2017 #49

    sportsfan148 said: View Post
    ...This time the error message was slightly different Error 0x80042405-0xA001A. It looks like I'm going to have to give up on the Media Creation Tool and use Rufus instead to create the bootable USB after downloading the ISO again with the Media Creation Tool
    Apparently you are not alone, at least 110 other have this problem...
    https://answers.microsoft.com/en-us/...8-ce7d2ea5b7d1


    There's no need for Rufus though. Just make an ISO using the MCT, mount it, then copy everything from it to a USB prepared using the following DiskPart commands:

    SELECT DISK n
    (use the appropriate disk number in place of 'n')
    CLEAN
    CREATE PARTITION PRIMARY
    SELECT PARTITION 1
    FORMAT FS=FAT32 QUICK
    ACTIVE
    (only required for legacy boot, UEFI doesn't need this)
    EXIT
      My ComputersSystem Spec

  10. Caledon Ken's Avatar
    Posts : 10,553
    Windows 10 Pro x64 Build 1803
       20 Dec 2017 #50

    I would run the disk clean up tool although it shouldn't be necessary. The ISO is self contained.

    Here is another alternative to Rufus using Diskpart. I used it successfully to create a bootable Kyhi's recovery disk.

    Image Restore from Network Location?? - Windows 10 Forums

    Yes I saw that comment of USB size and remembered you said yours was 16GB.

    Post back progress. Can't believe MS is putting resources to solve.

    Good luck
      My ComputerSystem Spec


 
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