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+VHDX BAT and Metadata Region Header Required Bit Not Set
+
+When converting a VMDK to VHDX the resulting VHDX's Region table has a small error. According to the VHDX specification the BAT and Metadata entries for the region header required bit should be set to 1.  In a VHDX created by qemu-img, this bit is not set.
+
+See Table 4: Known Region Properties of the VHDX specification.
+
+The structure format is as following from Structure 4: Region Table Entry:
+
+struct VHDX_REGION_TABLE_ENTRY {
+GUID Guid;
+UINT64 FileOffset;
+UINT32 Length;
+UINT32 Required:1;
+UINT32 Reserved:31;
+}
+
+The Required bit for VHDX specified BAT and Metadata Regions Required bit in the entry is not set as required in the current specification.
+
+VHDX Region Table in a valid VHDX
+
+Offset(h)    00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
+0x00030000   72 65 67 69 AE 8C 6B C6 02 00 00 00 00 00 00 00
+0x00030010   66 77 C2 2D 23 F6 00 42 9D 64 11 5E 9B FD 4A 08
+0x00030020   00 00 30 00 00 00 00 00 00 00 10 00 01 00 00 00  
+0x00030030   06 A2 7C 8B 90 47 9A 4B B8 FE 57 5F 05 0F 88 6E
+0x00030040   00 00 20 00 00 00 00 00 00 00 10 00 01 00 00 00
+
+VHDX Region Table in a VHDX converted by qemu-img from VMDK
+
+Offset(h)    00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
+0x00030000   72 65 67 69 AE 8C 6B C6 02 00 00 00 00 00 00 00
+0x00030010   66 77 C2 2D 23 F6 00 42 9D 64 11 5E 9B FD 4A 08
+0x00030020   00 00 30 00 00 00 00 00 00 00 10 00 00 00 00 00  
+0x00030030   06 A2 7C 8B 90 47 9A 4B B8 FE 57 5F 05 0F 88 6E
+0x00030040   00 00 20 00 00 00 00 00 00 00 10 00 00 00 00 00
+
+The fist bit at 0x0003002A and 0x0003004A should be set to 1.
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