Just tried with 900Mib buffer and that worked, just cant use the full 1GB.
I 20:44:02 ImgBurn Version 2.5.8.0 started!
I 20:44:02 Microsoft Windows 8 Professional x64 Edition (6.2, Build 9200)
I 20:44:02 Total Physical Memory: 33,466,220 KiB - Available: 28,099,972 KiB
I 20:44:02 Initialising SPTI...
I 20:44:02 Searching for SCSI / ATAPI devices...
I 20:44:02 -> Drive 1 - Info: ATAPI iHAS124 F CL02 (F:) (SATA)
I 20:44:03 -> Drive 2 - Info: ATAPI iHBS112 2 PL06 (E:) (SATA)
I 20:44:03 Found 1 DVD±RW/RAM and 1 BD-RE!
I 20:54:25 Operation Started!
I 20:54:25 Source File: D:\GA 6.ISO
I 20:54:25 Source File Sectors: 12,004,352 (MODE1/2048)
I 20:54:25 Source File Size: 24,584,912,896 bytes
I 20:54:25 Source File Volume Identifier: GA 6
I 20:54:25 Source File Volume Set Identifier: 4A32A4B200B72BE8
I 20:54:25 Source File Application Identifier: ImgBurn v2.5.8.0
I 20:54:25 Source File Implementation Identifier: ImgBurn
I 20:54:25 Source File File System(s): UDF (1.02)
I 20:54:25 Destination Device: [0:0:0] ATAPI iHBS112 2 PL06 (E:) (SATA)
I 20:54:25 Destination Media Type: BD-R (Disc ID: MEI-RA1-001)
I 20:54:25 Destination Media Supported Write Speeds: 4x, 6x, 8x, 10x, 12x
I 20:54:25 Destination Media Sectors: 12,219,392
I 20:54:25 Write Mode: BD
I 20:54:25 Write Type: DAO
I 20:54:25 Write Speed: 6x
I 20:54:25 Hardware Defect Management Active: No
I 20:54:25 BD-R Verify Not Required: Yes
I 20:54:25 Link Size: Auto
I 20:54:25 Lock Volume: Yes
I 20:54:25 Test Mode: No
I 20:54:25 OPC: Yes
I 20:54:25 BURN-Proof: Enabled
I 20:54:27 Write Speed Successfully Set! - Effective: 26,970 KB/s (6x)
I 20:54:27 Advanced Settings - Force HT: No, Online HT: No, OverSpeed: No, SmartBurn: Yes
I 20:54:27 CD/DVD Life Record Count: 10 - CD/DVD Record Count: 1
I 20:54:27 BD Life Record Count: 13 - BD Record Count: 5
I 20:54:55 Filling Buffer... (900 MiB)
I 20:54:59 Writing LeadIn...
I 20:55:02 Writing Session 1 of 1... (1 Track, LBA: 0 - 12004351)
I 20:55:02 Writing Track 1 of 1... (MODE1/2048, LBA: 0 - 12004351)