hangfire

Here it is - ====== PIONEER DVD-RW DVR-K17A 3.52 (ATA) Current Profile: DVD-ROM Disc Information: Status: Complete Erasable: No Sessions: 1 Sectors: 2,508,581 Size: 5,137,573,888 bytes Time: 557:29:56 (MM:SS:FF) TOC Information: Session 1... (LBA: 0) -> Track 01 (Mode 1, LBA: 0 - 2508580) -> LeadOut (LBA: 2508581) Track Information: Session 1... -> Track 01 (LTSA: 0, TS: 2508581, LRA: 2508580) Physical Format Information (Last Recorded - L0): Book Type: DVD-ROM Part Version: 1 Disc Size: 120mm Maximum Read Rate: 10.08Mbps Number of Layers: 2 Track Path: Opposite Track Path (OTP) Linear Density: 0.293 um/bit Track Density: 0.74 um/track First Physical Sector of Data Area: 196,608 Last Physical Sector of Data Area: 14,919,268 Last Physical Sector in Layer 0: 2,281,567 Physical Format Information (Last Recorded - L1): Book Type: DVD-ROM Part Version: 1 Disc Size: 120mm Maximum Read Rate: 10.08Mbps Number of Layers: 2 Track Path: Opposite Track Path (OTP) Linear Density: 0.293 um/bit Track Density: 0.74 um/track First Physical Sector of Data Area: 196,608 Last Physical Sector of Data Area: 14,919,268 Last Physical Sector in Layer 0: 2,281,567 Layer Information: Layer 0 Sectors: 2,084,960 (83.11%) Layer 1 Sectors: 423,621 (16.89%) ======= OS is Win_7 TIA

Hi I am newbie here and am trying to take backup of a Bootable OS DVD. When I create an ISO from the DVD, it creates a ISO file of about 5GB which is double layer, and DVD is of 4,7 GB. Kinda lost here, am I doing anything wrong? TIA.