Which drive is \Device\Harddisk1\DR1?
Run the following PowerShell command as Administrator:
Get-PhysicalDisk | Select -Prop DeviceId,FriendlyName,SerialNumber
This will show output like:
DeviceId FriendlyName SerialNumber
-------- ------------ ------------
1 ST1000DM003-9YN162 S1D2RPMB
5 ST1000DM003-1CH162 Z1D3CPP3
2 ST1000DM003-9YN162 S1D34BYN
0 Corsair Force LS SSD 144381700001017402C2
4 WDC WD10EFRX-68PJCN0 WD-WCC4J9CC8112
3 Samsung SSD 950 PRO 256GB 0025_3853_61B0_3DD0.
The DeviceId corresponds to the N in the \Device\HardDiskN path.
This command is useful when you are using Storage Spaces, which can prevent the physical disks from appearing in the tools referenced in the other answers, like DiskPart.
This "dd" utility worked for me. But it must be run as administrator to include the */Harddisk/DRx mappings!
dd --list <--- as administrator
It provides a report that allows tracing between the various naming schemes and includes the DRn types.
http://www.chrysocome.net/dd
The mappings is not completely obvious but if one assumes that the NT Block Device Objects are listed in order I think the correct drive can be inferred.
If you have unique drive sizes, it is simple since the report directly shows the size for each DRn.
Update 1/23/2015: Adding sample output. This system just has one physical 512GB drive with 6 partitions and a CDRom.
rawwrite dd for windows version 0.5.
Written by John Newbigin <[email protected]>
This program is covered by the GPL. See copying.txt for details
Win32 Available Volume Information
\\.\Volume{a502c160-1241-4338-a345-b76f4a973d9f}\
link to \\?\Device\HarddiskVolume5
fixed media
Mounted on \\.\c:
\\.\Volume{c8a5d58a-7083-440b-a5c1-e262ca3a9d7d}\
link to \\?\Device\HarddiskVolume6
fixed media
Mounted on \\.\g:
\\.\Volume{9d1b0246-5f39-4ef8-9016-ef83d03d7255}\
link to \\?\Device\HarddiskVolume4
fixed media
Mounted on \\.\x:
\\.\Volume{4ca2b56b-0778-4a61-8979-6ad9fa1df45f}\
link to \\?\Device\HarddiskVolume7
fixed media
Mounted on \\.\y:
\\.\Volume{d20ed74c-0607-11e4-8256-8086f2c4e4ff}\
link to \\?\Device\HarddiskVolume8
removeable media
Mounted on \\.\e:
\\.\Volume{570d1087-e7b4-11e3-824c-806e6f6e6963}\
link to \\?\Device\CdRom0
CD-ROM
Mounted on \\.\d:
\\.\Volume{d20edf99-0607-11e4-8256-8086f2c4e4ff}\
link to \\?\Device\ClvtDrv0
CD-ROM
Mounted on \\.\s:
(This section is only present when run as admin)
NT Block Device Objects
\\?\Device\CdRom0
size is 2147483647 bytes
\\?\Device\Harddisk0\Partition0
link to \\?\Device\Harddisk0\DR0 <--------------------------- DR0
Fixed hard disk media. Block size = 512
size is 512110190592 bytes
\\?\Device\Harddisk0\Partition1
link to \\?\Device\HarddiskVolume1
\\?\Device\Harddisk0\Partition2
link to \\?\Device\HarddiskVolume2
Fixed hard disk media. Block size = 512
size is 41943040 bytes
\\?\Device\Harddisk0\Partition3
link to \\?\Device\HarddiskVolume3
Fixed hard disk media. Block size = 512
size is 134217728 bytes
\\?\Device\Harddisk0\Partition4
link to \\?\Device\HarddiskVolume4
\\?\Device\Harddisk0\Partition5
link to \\?\Device\HarddiskVolume5
\\?\Device\Harddisk0\Partition6
link to \\?\Device\HarddiskVolume6
\\?\Device\Harddisk0\Partition7
link to \\?\Device\HarddiskVolume7
\\?\Device\Harddisk1\Partition0
link to \\?\Device\Harddisk1\DR1
\\?\Device\Harddisk1\Partition1
link to \\?\Device\HarddiskVolume8
Virtual input devices
/dev/zero (null data)
/dev/random (pseudo-random data)
- (standard input)
Virtual output devices
- (standard output)
Added by barlop
I will just include a pic that illustrates somewhat 
You can also do this as administrator:
C:\windows\system32>diskpart
Microsoft DiskPart version 6.1.7601
Copyright (C) 1999-2008 Microsoft Corporation.
On computer: COMPUTERNAME
DISKPART> list disk
Disk ### Status Size Free Dyn Gpt
-------- ------------- ------- ------- --- ---
Disk 0 Online 476 GB 11 GB
Disk 1 Online 59 GB 0 B
DISKPART> sel disk 1
Disk 1 is now the selected disk.
DISKPART> list part
Partition ### Type Size Offset
------------- ---------------- ------- -------
* Partition 1 Primary 59 GB 0 B