Known good backup set now failing to restore - help

I have a server 2008r2 (SBS 2011) USB drive with a backup on it I need to restore from a second time.
First restore worked.. But I screwed up and missed the second volume (data) and need to run the restore again. but it won't work now.

all attempts to 'see' the backup fail !
In fact WBADMIN says there is no backup there (mounted USB drive as i:)

C:\>wbadmin get versions -backuptarget:i:
wbadmin 1.0 - Backup command-line tool
(C) Copyright 2013 Microsoft Corporation. All rights reserved.
ERROR - No backup was found.

I have closely compared the files to other good backup and all the correct (as far as I can tell) folders, .XML, and VHD files are there.

The odd thing is I've already restored from this USB drive once already

Ignoring the fun and games to do this in a VM...

I mounted the drive through, booted from the DVD/ISO, selected repair and it ran..
Like a plank, I forgot to re-arrange the volumes, format the C and D and even restore the D drive.
So I need to do it again, but it won't.. the backup set that worked for a restore 3 days ago now says it's not there.

Does the restore process somehow kill the backup?
How do I get it back.

Directory listing of backup drive:

C:\>dir /s i:
 Volume in drive I is Backup Drive 1
 Volume Serial Number is 762B-8D58
 Directory of I:\
08/05/2012  23:01    <DIR>          WindowsImageBackup
               0 File(s)              0 bytes
 Directory of I:\WindowsImageBackup
08/05/2012  23:01    <DIR>          .
08/05/2012  23:01    <DIR>          ..
18/10/2016  12:11    <DIR>          SERVER-01
               0 File(s)              0 bytes
 Directory of I:\WindowsImageBackup\SERVER-01
18/10/2016  12:11    <DIR>          .
18/10/2016  12:11    <DIR>          ..
26/10/2016  12:36    <DIR>          Backup 2016-10-18 110008
18/10/2016  12:11    <DIR>          Catalog
08/05/2012  23:01                16 MediaId
08/05/2012  23:27    <DIR>          SPPMetadataCache
               1 File(s)             16 bytes
 Directory of I:\WindowsImageBackup\SERVER-01\Backup 2016-10-18 110008
26/10/2016  12:36    <DIR>          .
26/10/2016  12:36    <DIR>          ..
17/10/2016  23:32             1,078 2edc4444-355c-4999-a73c-d14d5d108e16_AdditionalFilesc3b9f3c7-5e52-4d5e-8b20-19adc95a34c7.xml
17/10/2016  23:32           324,412 2edc4444-355c-4999-a73c-d14d5d108e16_Components.xml
17/10/2016  23:32             7,236 2edc4444-355c-4999-a73c-d14d5d108e16_RegistryExcludes.xml
17/10/2016  23:32             6,002 2edc4444-355c-4999-a73c-d14d5d108e16_Writer12ce4370-5bb7-4c58-a76a-e5d5097e3674.xml
17/10/2016  23:32             1,934 2edc4444-355c-4999-a73c-d14d5d108e16_Writer2a40fd15-dfca-4aa8-a654-1f8c654603f6.xml
17/10/2016  23:32             1,746 2edc4444-355c-4999-a73c-d14d5d108e16_Writer35500004-0201-0000-0000-000000000000.xml
17/10/2016  23:32             1,450 2edc4444-355c-4999-a73c-d14d5d108e16_Writer35e81631-13e1-48db-97fc-d5bc721bb18a.xml
17/10/2016  23:32             1,390 2edc4444-355c-4999-a73c-d14d5d108e16_Writer368753ec-572e-4fc7-b4b9-ccd9bdc624cb.xml
17/10/2016  23:32             8,530 2edc4444-355c-4999-a73c-d14d5d108e16_Writer4969d978-be47-48b0-b100-f328f07ac1e0.xml
17/10/2016  23:32             3,662 2edc4444-355c-4999-a73c-d14d5d108e16_Writer4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f.xml
17/10/2016  23:32             1,488 2edc4444-355c-4999-a73c-d14d5d108e16_Writer542da469-d3e1-473c-9f4f-7847f01fc64f.xml
17/10/2016  23:32             1,630 2edc4444-355c-4999-a73c-d14d5d108e16_Writer59b1f0cf-90ef-465f-9609-6ca8b2938366.xml
17/10/2016  23:32             2,024 2edc4444-355c-4999-a73c-d14d5d108e16_Writer6f5b15b5-da24-4d88-b737-63063e3a1f86.xml
17/10/2016  23:32            11,258 2edc4444-355c-4999-a73c-d14d5d108e16_Writer76fe1ac4-15f7-4bcd-987e-8e1acb462fb7.xml
17/10/2016  23:32             1,484 2edc4444-355c-4999-a73c-d14d5d108e16_Writera6ad56c2-b509-4e6c-bb19-49d8f43532f0.xml
17/10/2016  23:32             3,844 2edc4444-355c-4999-a73c-d14d5d108e16_Writerafbab4a2-367d-4d15-a586-71dbb18f8485.xml
17/10/2016  23:32             1,850 2edc4444-355c-4999-a73c-d14d5d108e16_Writerb2014c9e-8711-4c5c-a5a9-3cf384484757.xml
17/10/2016  23:32             6,376 2edc4444-355c-4999-a73c-d14d5d108e16_Writerbe000cbe-11fe-4426-9c58-531aa6355fc4.xml
17/10/2016  23:32             1,934 2edc4444-355c-4999-a73c-d14d5d108e16_Writerbe9ac81e-3619-421f-920f-4c6fea9e93ad.xml
17/10/2016  23:32             7,110 2edc4444-355c-4999-a73c-d14d5d108e16_Writercd3f2362-8bef-46c7-9181-d62844cdc0b2.xml
17/10/2016  23:32             2,398 2edc4444-355c-4999-a73c-d14d5d108e16_Writerd76f5a28-3092-4589-ba48-2958fb88ce29.xml
17/10/2016  23:32             5,032 2edc4444-355c-4999-a73c-d14d5d108e16_Writerda452614-4858-5e53-a512-38aab25c61ad.xml
17/10/2016  23:32             1,874 2edc4444-355c-4999-a73c-d14d5d108e16_Writerf08c1483-8407-4a26-8c26-6c267a629741.xml
28/10/2016  18:43   259,591,831,552 84f41d66-5419-11e4-98f8-001b21d214c8.vhd
17/10/2016  23:32             1,620 BackupSpecs.xml
18/10/2016  12:11        62,932,992 ec501f43-92b9-11e1-b04a-806e6f6e6963.vhd
17/10/2016  23:25   265,329,897,984 ec501f44-92b9-11e1-b04a-806e6f6e6963.vhd
              27 File(s) 524,985,069,890 bytes
 Directory of I:\WindowsImageBackup\SERVER-01\Catalog
18/10/2016  12:11    <DIR>          .
18/10/2016  12:11    <DIR>          ..
17/10/2016  23:32         3,543,506 BackupGlobalCatalog
18/10/2016  12:11         3,543,506 GlobalCatalog
               2 File(s)      7,087,012 bytes
 Directory of I:\WindowsImageBackup\SERVER-01\SPPMetadataCache
08/05/2012  23:27    <DIR>          .
08/05/2012  23:27    <DIR>          ..
               0 File(s)              0 bytes
     Total Files Listed:
              30 File(s) 524,992,156,918 bytes
              15 Dir(s)  1,475,133,304,832 bytes free
C:\>

Thanks in advance

David (Nobby) Barnes