I suspect someone at the company decided to do a partition span, i.e.:
(taken a look from Linux Debian 9)
Drive #1:
Disk /dev/sdc: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x11722464
Device Boot Start End Sectors Size Id Type
/dev/sdc1 * 2048 206847 204800 100M 7 HPFS/NTFS/exFAT
/dev/sdc2 206848 1952612351 1952405504 931G 7 HPFS/NTFS/exFAT
/dev/sdc3 1952612352 1953533951 921600 450M 27 Hidden NTFS WinRE
Drive #2:
Disk /dev/sdd: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
As you can see for yourself, both of the hard drives are 500 GB in size.
At the same time, look at the size of the partition /dev/sdc2, it's double the size of of the drive.
I tried:
# ldmtool create all
[
]
no result here.
I am fairly familiar with Windows 10, but not spanned disks or partitions.
The original computer died. Beyond repair, I am quite sure if there really is a spanned partition, the person who set it up does not work here anymore and declined to help us in this matter.
Both of the drives spin-up fast and without a problem, so I really think this should be software matter.
From what I gather, a Windows 10, an upgrade from Windows 7 has been installed on it.
We bought a new PC with Windows 10 and plugged in those drives in hope it would auto-detect the spanned partition, but the Windows drive manager prompts me to initiate the second (seen from Linux as non-formatted) drive.
Any clues and hints from users experienced with spanned volumes will be appreciated.
EDIT 1:
After installation of dmraid and reboot of the Linux server, I see in addition to the above:
Disk /dev/mapper/isw_cffbdajifj_Volume0: 931.5 GiB, 1000210694144 bytes, 1953536512 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disklabel type: dos
Disk identifier: 0x11722464
Device Boot Start End Sectors Size Id Type
/dev/mapper/isw_cffbdajifj_Volume0-part1 * 2048 206847 204800 100M 7 HPFS/NTFS/exFAT
/dev/mapper/isw_cffbdajifj_Volume0-part2 206848 1952612351 1952405504 931G 7 HPFS/NTFS/exFAT
/dev/mapper/isw_cffbdajifj_Volume0-part3 1952612352 1953533951 921600 450M 27 Hidden NTFS WinRE
Disk /dev/mapper/isw_cffbdajifj_Volume01: 100 MiB, 104857600 bytes, 204800 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disklabel type: dos
Disk identifier: 0x73736572
Device Boot Start End Sectors Size Id Type
/dev/mapper/isw_cffbdajifj_Volume01-part1 1920221984 3736432267 1816210284 866G 72 unknown
/dev/mapper/isw_cffbdajifj_Volume01-part2 1936028192 3889681299 1953653108 931.6G 6c unknown
/dev/mapper/isw_cffbdajifj_Volume01-part3 0 0 0 0B 0 Empty
/dev/mapper/isw_cffbdajifj_Volume01-part4 27722122 27722568 447 223.5K 0 Empty
Partition 1 does not start on physical sector boundary.
Partition 2 does not start on physical sector boundary.
Partition 4 does not start on physical sector boundary.
Partition table entries are not in disk order.
Disk /dev/mapper/isw_cffbdajifj_Volume02: 931 GiB, 999631618048 bytes, 1952405504 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disklabel type: dos
Disk identifier: 0x6a205247
Device Boot Start End Sectors Size Id Type
/dev/mapper/isw_cffbdajifj_Volume02-part1 7250038 1707125378 1699875341 810.6G 72 unknown
/dev/mapper/isw_cffbdajifj_Volume02-part2 1818959973 3754989316 1936029344 923.2G 74 unknown
/dev/mapper/isw_cffbdajifj_Volume02-part3 1953251627 3771827541 1818575915 867.2G 43 unknown
/dev/mapper/isw_cffbdajifj_Volume02-part4 2693529610 2693581498 51889 25.3M 61 SpeedStor
Partition 1 does not start on physical sector boundary.
Partition 2 does not start on physical sector boundary.
Partition 3 does not start on physical sector boundary.
Partition 4 does not start on physical sector boundary.
Disk /dev/mapper/isw_cffbdajifj_Volume03: 450 MiB, 471859200 bytes, 921600 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disklabel type: dos
Disk identifier: 0x73736572
Device Boot Start End Sectors Size Id Type
/dev/mapper/isw_cffbdajifj_Volume03-part1 1920221984 3736432267 1816210284 866G 72 unknown
/dev/mapper/isw_cffbdajifj_Volume03-part2 1936028192 3889681299 1953653108 931.6G 6c unknown
/dev/mapper/isw_cffbdajifj_Volume03-part3 0 0 0 0B 0 Empty
/dev/mapper/isw_cffbdajifj_Volume03-part4 27722122 27722568 447 223.5K 0 Empty
Partition 1 does not start on physical sector boundary.
Partition 2 does not start on physical sector boundary.
Partition 4 does not start on physical sector boundary.
Partition table entries are not in disk order.
EDIT 2:
My suspicion was wrong about the spanned partition or drive.
It is actually a Fake RAID 0 as discovered with the help of dmraid.
