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改入注册表就行了,看上去是512,但实际上已经达到900M了 
 
Windows Registry Editor Version 5.00 
 
 
[HKEY_LOCAL_MACHINE\system\ControlSet001\Enum\Root\LEGACY_EWF] 
"NextInstance"=dword:00000001 
 
[HKEY_LOCAL_MACHINE\system\ControlSet001\Enum\Root\LEGACY_EWF\0000] 
"Service"="EWF" 
"Legacy"=dword:00000001 
"ConfigFlags"=dword:00000020 
"Class"="LegacyDriver" 
"ClassGUID"="{8ECC055D-047F-11D1-A537-0000F8753ED1}" 
"DeviceDesc"="EWF" 
"Capabilities"=dword:00000000 
 
[HKEY_LOCAL_MACHINE\system\ControlSet001\Services\EWF] 
"ErrorControl"=dword:00000001 
"Group"="System Bus Extender" 
"Start"=dword:00000000 
"Type"=dword:00000001 
 
[HKEY_LOCAL_MACHINE\system\ControlSet001\Services\EWF\FBA] 
"OVSize"=dword:00000000 
"OVLevel"=dword:00000001 
"PVConfigs"=dword:00000001 
"EwfEnable"=hex(7):31,00,00,00,00,00 
"EnableLazyWrite"=hex(7):31,00,00,00,00,00 
"PVDisk"=hex(7):30,00,00,00,00,00 
"PVPart"=hex(7):31,00,00,00,00,00 
"PVDiskType"=hex(7):31,00,00,00,00,00 
"PVOptimize"=hex(7):31,00,00,00,00,00 
"PVType"=hex(7):31,00,00,00,00,00 
 
[HKEY_LOCAL_MACHINE\system\ControlSet001\Services\EWF\Parameters] 
 
[HKEY_LOCAL_MACHINE\system\ControlSet001\Services\EWF\Parameters\Protected] 
 
[HKEY_LOCAL_MACHINE\system\ControlSet001\Services\EWF\Parameters\Protected\Volume0] 
"Type"=dword:00000001 
"ArcName"="multi(0)disk(0)rdisk(0)partition(1)" 
"Enabled"=dword:00000001 
 
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{71A27CDD-812A-11D0-BEC7-08002BE2092F}] 
"UpperFilters"=hex(7):56,00,6f,00,6c,00,73,00,6e,00,61,00,70,00,00,00,65,00,77,\ 
  00,66,00,00,00,00,00 
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