well, i'm assuming this either means that the media is bad or windows 7 is causing something to happen (i.e. power management) when the screen saver comes on.
imgburn log:
I 15:06:53 ImgBurn Version 2.5.0.0 started!
I 15:06:53 Microsoft Windows 7 Ultimate x64 Edition (6.1, Build 7600)
I 15:06:53 Total Physical Memory: 4,126,644 KB - Available: 2,389,756 KB
W 15:06:53 AnyDVD can interfere with ImgBurn's ability to verify accurately, please ensure it's disabled!
I 15:06:53 Initialising SPTI...
I 15:06:53 Searching for SCSI / ATAPI devices...
I 15:06:53 Found 1 DVD-ROM, 1 DVD±RW and 1 HD DVD-ROM/BD-RE!
I 15:08:30 Operation Started!
I 15:08:30 Source Device: [0:0:0] HL-DT-ST BD-RE BE06LU10 YE05 (G
(USB)
I 15:08:30 Source Media Type: BD-R (Speeds: 0.2x, 0.3x, 0.6x, 1x, 1.3x, 1.6x)
I 15:08:30 Source Media Sectors: 22,990,016
I 15:08:30 Source Media Size: 47,083,552,768 bytes
I 15:08:30 Source Media Volume Identifier: CRANK_2_HIGH_VOLTAGE
I 15:08:30 Source Media Volume Set Identifier: 8CBE03B87890D504_VOLUME_SET_ID
I 15:08:30 Source Media Application Identifier: APPLICATION_ID
I 15:08:30 Source Media Implementation Identifier: IMPLEMENTATION_ID
I 15:08:30 Source Media File System(s): UDF (2.50)
I 15:08:30 Read Speed (Data/Audio): MAX / 8x
I 15:08:30 Destination File: \\xxx\CRANK_2_HIGH_VOLTAGE.ISO
I 15:08:30 Destination Free Space: 421,461,512,192 Bytes (411,583,508 KB) (401,937 MB) (392 GB)
I 15:08:30 Destination File System: NTFS
I 15:08:30 File Splitting: Auto
I 15:08:35 Reading Session 1 of 1... (1 Track, LBA: 0 - 22990015)
I 15:08:35 Reading Track 1 of 1... (MODE1/2048, LBA: 0 - 22990015)
W 15:54:50 Failed to Read Sector 11622112 - Reason: Medium Not Present
W 15:54:50 Sector 11622112 maps to File: \BDMV\STREAM\00317.m2ts
W 15:54:51 Retrying (1 of 20)...
W 15:55:00 Retry Failed - Reason: Medium Not Present
W 15:55:02 Retrying (2 of 20)...
W 15:55:11 Retry Failed - Reason: Medium Not Present
W 15:55:14 Retrying (3 of 20)...
W 15:55:23 Retry Failed - Reason: Medium Not Present
W 15:55:25 Retrying (4 of 20)...
W 15:55:34 Retry Failed - Reason: Medium Not Present
W 15:55:36 Retrying (5 of 20)...
W 15:55:45 Retry Failed - Reason: Medium Not Present
W 15:55:47 Retrying (6 of 20)...
W 15:55:56 Retry Failed - Reason: Medium Not Present
W 15:55:59 Retrying (7 of 20)...
W 15:56:07 Retry Failed - Reason: Medium Not Present
W 15:56:10 Retrying (8 of 20)...
W 15:56:19 Retry Failed - Reason: Medium Not Present
W 15:56:21 Retrying (9 of 20)...
W 15:56:30 Retry Failed - Reason: Medium Not Present
W 15:56:33 Retrying (10 of 20)...
W 15:56:42 Retry Failed - Reason: Medium Not Present
W 15:56:44 Retrying (11 of 20)...
W 15:56:53 Retry Failed - Reason: Medium Not Present
W 15:56:55 Retrying (12 of 20)...
W 15:57:04 Retry Failed - Reason: Medium Not Present
W 15:57:06 Retrying (13 of 20)...
W 15:57:15 Retry Failed - Reason: Medium Not Present
W 15:57:17 Retrying (14 of 20)...
W 15:57:26 Retry Failed - Reason: Medium Not Present
W 15:57:29 Retrying (15 of 20)...
W 15:57:38 Retry Failed - Reason: Medium Not Present
W 15:57:40 Retrying (16 of 20)...
W 15:57:49 Retry Failed - Reason: Medium Not Present
W 15:57:51 Retrying (17 of 20)...
W 15:58:00 Retry Failed - Reason: Medium Not Present
W 15:58:03 Retrying (18 of 20)...
W 15:58:12 Retry Failed - Reason: Medium Not Present
W 15:58:14 Retrying (19 of 20)...
W 15:58:23 Retry Failed - Reason: Medium Not Present
W 15:58:25 Retrying (20 of 20)...
W 15:58:34 Retry Failed - Reason: Medium Not Present
W 18:37:20 Failed to Read Sector 11622112 - Reason: Medium Not Present
W 18:37:20 Sector 11622112 maps to File: \BDMV\STREAM\00317.m2ts
I 18:37:29 Abort Request Acknowledged
E 18:37:33 Failed to Read Sector 11622113 - Reason: Medium Not Present
E 18:37:33 Sector 11622113 maps to File: \BDMV\STREAM\00317.m2ts
E 18:37:33 Failed to Read Sectors!
I 18:37:34 Exporting Graph Data...
I 18:37:34 Graph Data File: C:\Users\xxxx\AppData\Roaming\ImgBurn\Graph Data Files\HL-DT-ST_BD-RE_BE06LU10_YE05_SATURDAY-SEPTEMBER-12-2009_3-08_PM_N-A.ibg
I 18:37:34 Export Successfully Completed!
E 18:37:34 Operation Aborted! - Duration: 03:29:03
E 18:37:34 Average Read Rate: 1,853 KB/s (0.4x) - Maximum Read Rate: 14,394 KB/s (3.2x)