http://technet.microsoft.com/en-us/library/cc772172.aspx
You can use this to perform an emergency delete of all snapshots on a given platform. Consider the following output of VSSAdmin (I have truncated it)
C:\Users\putleym>vssadmin list shadows
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2005 Microsoft Corp.
Contents of shadow copy set ID: {fcd10773-6df9-48e1-abf9-08915b767e47}
Contained 1 shadow copies at creation time: 1/11/2014 6:09:35 AM
Shadow Copy ID: {ef15ddef-5deb-4cb4-b8bb-d589eda5e494}
Original Volume: (O:)\\?\Volume{94695b4d-ea8e-11e1-87dc-001cc4dd04da}\
Shadow Copy Volume: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy2
Originating Machine: FSH02.DOMAIN.ORG
Service Machine: FSH02.DOMAIN.ORG
Provider: 'Microsoft Software Shadow Copy provider 1.0'
Type: DataVolumeRollback
Attributes: Persistent, No auto release, No writers, Differential
Contents of shadow copy set ID: {b445352f-252b-4b20-965e-4685fa6038c7}
Contained 1 shadow copies at creation time: 1/12/2014 6:03:09 AM
Shadow Copy ID: {adea4e22-05a3-485c-9075-df20b4cbf11b}
Original Volume: (O:)\\?\Volume{94695b4d-ea8e-11e1-87dc-001cc4dd04da}\
Shadow Copy Volume: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy3
Originating Machine: FSH02.DOMAIN.ORG
Service Machine: FSH02.DOMAIN.ORG
Provider: 'Microsoft Software Shadow Copy provider 1.0'
Type: DataVolumeRollback
Attributes: Persistent, No auto release, No writers, Differential
You can see there are two snapshots, if we run DiskShadow we will be given a DiskShadow prompt and we can execute Delete Shadows All. Here is the screen output (I have truncated it)
DISKSHADOW> delete shadows all
Deleting shadow copy {9fe1172d-6158-455e-ba11-5ea5065b94bc} on volume \\?\Volume
{94695b4d-ea8e-11e1-87dc-001cc4dd04da}\ from provider {b5946137-7b9f-4925-af80-5
1abd60b20d5} [Attributes: 0x00020019]...
Deleting shadow copy {ef15ddef-5deb-4cb4-b8bb-d589eda5e494} on volume \\?\Volume
{94695b4d-ea8e-11e1-87dc-001cc4dd04da}\ from provider {b5946137-7b9f-4925-af80-5
1abd60b20d5} [Attributes: 0x00020019]...
Deleting shadow copy {adea4e22-05a3-485c-9075-df20b4cbf11b} on volume \\?\Volume
{94695b4d-ea8e-11e1-87dc-001cc4dd04da}\ from provider {b5946137-7b9f-4925-af80-5
1abd60b20d5} [Attributes: 0x00020019]...
Number of shadow copies deleted: 2
Cheers!
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