baronluigi
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Posts posted by baronluigi
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Could be down to how each of the different drives in the different PC's "reads" the data? Maybe one drive does some kind of data reading that the other doesn't?
As long as the discs read to an image, I wouldn't be too worried about differing CRC's. If you're really worried, then watch the discs' contents in a DVD player. If they play fine, then I wouldn't worry. There are so many other things in life to worry about.
To be honest, I could consider myself a kind of paranoid regarding to this kind of matter. Yeah, the content of the ISO is fully playable but this crc difference makes me wonder if there is some kind of video data missing.
Related to this, there have been times that while I have not received any error when creating a ISO, I receive misscompare error messages when I verify that ISO image against the disc inside the drive. I cannot understand why either.
The disc has some skratches, could this missmatch be caused by this?
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I made an ISO image from an unprotected DVD movie disk. I have copied the disk twice, without receiving any error neither in the copy proccess nor in the verification. Each copy ( and its respective verification) was made in a different drive and computer.
However, the CRC I get of each ISO is different. How is this posible? Does this mean that the copies are damaged?
I did not posted the logs because I thought there was no point in doing so, due to nothing out of ordinary appears in them.
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I recopied the disc again and this time everything went perfect. I still cannot understand what happened in the previous try.
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Now we talk about miscompares, I want to comment something that has recently happened to me. I have not enclosed the logfile along with this message because my question is more related to other thing, although the miscompare message imgburn showed me made me realize about that problem.
Yesterday I copied an unprotected DVD disc to my computer. The process went perfectly, as can be seen in the logfile of the copy process
I 23:30:51 ImgBurn Version 2.5.7.0 started!
I 23:30:51 Microsoft Windows 7 Home Premium x64 Edition (6.1, Build 7601 : Service Pack 1)
I 23:30:51 Total Physical Memory: 3.780.256 KB - Available: 1.102.612 KB
I 23:30:51 Initialising SPTI...
I 23:30:51 Searching for SCSI / ATAPI devices...
I 23:30:52 -> Drive 1 - Info: ELBY CLONEDRIVE 1.4 (F:) (SCSI)
I 23:31:01 -> Drive 2 - Info: HL-DT-ST DVDRAM GT34N AS00-10 (E:) (SATA)
I 23:31:01 Found 1 DVD±RW/RAM and 1 BD-ROM/HD DVD-ROM!
I 23:31:47 Operation Started!
I 23:31:47 Source Device: [2:0:0] HL-DT-ST DVDRAM GT34N AS00 (E:) (SATA)
I 23:31:47 Source Media Type: DVD-ROM (Book Type: DVD-ROM)
I 23:31:47 Source Media Sectors: 3.973.168 (Track Path: OTP - L0: 2.079.584 - L1: 1.893.584)
I 23:31:47 Source Media Size: 8.137.048.064 bytes
I 23:31:47 Source Media Volume Identifier: BERLUSCONI_TRES_IDIOMAS
I 23:31:47 Source Media Volume Set Identifier: 3C2F88B8
I 23:31:47 Source Media Application Identifier: DVD Studio Pro:4.0.3, DSPInterface:382, DVDAuthoring:372, DVDBase:396(Encoder: 483), Oxygene:409
I 23:31:47 Source Media Implementation Identifier: Apple Computer, Inc.
I 23:31:47 Source Media File System(s): ISO9660; UDF (1.02)
I 23:31:47 Read Speed (Data/Audio): MAX / 8x
I 23:31:47 Destination File: D:\BERLUSCONI_TRES_IDIOMAS DUMP PORTATIL.ISO
I 23:31:47 Destination Free Space: 27.147.956.224 Bytes (26.511.676,00 KB) (25.890,31 MB) (25,28 GB)
I 23:31:47 Destination File System: NTFS
I 23:31:47 File Splitting: Auto
I 23:31:53 Reading Session 1 of 1... (1 Track, LBA: 0 - 3973167)
I 23:31:53 Reading Track 1 of 1... (MODE1/2048, LBA: 0 - 3973167)
I 23:31:53 Reading Layer 0... (LBA: 0 - 2079583)
I 23:54:56 Reading Layer 1... (LBA: 2079584 - 3973167)
I 00:12:59 Exporting Graph Data...
I 00:13:00 Graph Data File: C:\Users\Urolakosta\AppData\Roaming\ImgBurn\Graph Data Files\HL-DT-ST_DVDRAM_GT34N_AS00_LUNES-21-DE-DICIEMBRE-DE-2015_23-31_N-A.ibg
I 00:13:00 Export Successfully Completed!
I 00:13:00 Operation Successfully Completed! - Duration: 00:41:11
I 00:13:00 Average Read Rate: 3.215 KB/s (2.3x) - Maximum Read Rate: 13.333 KB/s (9.6x)
However, when I tried to verify the ISO image with the original disc, I received a Miscompare error message as soon the process started. The thing is that I made a checksum analysis over the ISO file aftewards and it had a different CRC32 (I have previously copied the same disc in other computer using another drive, and there I obtained another CRC, although I was able to verify the original disc, with no problem at all)
Is the first time this happens to me. I cannot understand why, considering that everything went quite fine in the copy process (Sometimes to reading speed decreased almost reaching 0X, however, I never obtained any reading errors).
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Well, A week has passed since I opened this thread and I still continue with this "issue", although now it reads the discs as fast as in the past most of the times, so I cannot complain. I have not had any writing error either (although due to my discs don´t allow being written in low speeds, I have not been able to write them at 4x as I wished. But I think I cannot blame the drive for that.) so I think I am fine with it. I will update with more news if drives health drops considerably. Thanks.
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If the drive gets it into its head that 6x is the max speed, that's all you're going to get from it.
The only time the trick will work is if the max speed is listed at 16x or whatever and the 'current' speed is lower.
You can't make a drive (and its firmware) do something it doesn't want to do.
Eject and reinsert the disc a few times. Maybe it'll work eventually.
Well thanks. It does not seem there is any "alternative" firmware for this drive so I guess I will have to go on with this drive. At least is not a Physicall failure. I mean, this issue does not want to say that the drive is about to fail.
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Drives often slow themselves down in order to minimise noise. It's sometimes called Riplock, quiet mode, silent mode etc.
If you're playing a film using the drive as the reader, you wouldn't want it spinning at max speed as it would annoy you.
I cannot explain why this has 'suddenly' started happening. It's something built into the drive's firmware and so should have always been an issue.
I actually recall spending time trying to get around this issue with certain newer LG drives and I could have sworn it made it into 2.5.7.0 and (or maybe just) 2.5.8.0. It'll be mentioned in the changelog.
I very much doubt the 'trick' will activate in Verify mode though as that's really just meant for verifying burnt discs. You'd need to check the read speed in Read mode.
The 'Current Read Speed' is what the drive reports it's currently configured to read at. So it's going to start at around 2.5x and will end at about 6x. If a program simply issues lots of 'Read' commands, that's the speed the drive will go. Software can issue a request to change the speed but the drive may ignore or override it.
Thanks for the answer, but if the maximum available speed is of 6x, how was I able to get faster speeds? Is not there any way to change this?
Does this mean I am forced to use slow speeds from now on?
Many thanks.
EDIT: Oh, I did not understand what you meant to say at first, but know I did. You say that the "trick" you created to bypass this issue with IMGBURN won´t trigger while using Verify method. I will try making a copy and I will tell you.
EDIT2: Dumped the previously mentioned DVDROM disc and I am still getting slow speeds, between 3.5 to 5.5X,.
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This may not be an Imgburn issue since the problem also happens with other programs like CDBURNERXP, but I decided to open this thread because the drive I mentioned in the title has been mentioned in previous threads
I bought this drive 2 years ago and I have had no problems until yesterday morning. I have to make clear that I don´t receive any reading errors, which is a relieve. I am just facing slow reading speeds and I cannot understand why.
After several tries, I have reached to these conclusions:
- The slowdown problems only happens while reading original unprotected DVDS/ Audio Cds/ PSX-PS2 Games. Not always, but most of the times. For example a couple of minutes ago I copied an unprotected DVD to my hard disk and it went really fast. I tried to do the same again with the same disc but this time I did not get any speed faster than 5X.
- While copying burned disc there is no slowdown problems at all. (I have not tried burning any disc yet, though I always burn everything at 4x)
- When the slowdowns happen, I have realized that the drive starts doing that classical spinning noise every drive does while reading a disc. However, it shuts up as soon as it starts, as if the drive was turned off or something.
- As I previously said, this problem started yesterday and even with slowdowns I have not had any read errors yet. All the copy process finish correctly, slowly, but correctly.
- The problem is even worse while triying to copy audio discs. The maximum speeds I get are between 3.6x-5x (when my máximum speed is of 48!)
Could anyone help me with this? Thanks.
EDIT: I tried to dump the disc with Imgburn last version and this is what appears in the log
I 11:07:52 ImgBurn Version 2.5.8.0 started!
I 11:07:52 Microsoft Windows XP Home Edition (5.1, Build 2600 : Service Pack 3)
I 11:07:52 Total Physical Memory: 1.834.284 KiB - Available: 735.632 KiB
I 11:07:53 Initialising SPTI...
I 11:07:53 Searching for SCSI / ATAPI devices...
I 11:07:53 -> Drive 1 - Info: HL-DT-ST DVDRAM GH24NS95 RN01-33 (E:) (ATA)
I 11:07:53 -> Drive 2 - Info: PHILIPS DVD8801 NW02 (D:) (ATA)
I 11:07:53 Found 1 DVD±RW and 1 DVD±RW/RAM!
I 11:08:36 Operation Started!
I 11:08:36 Source Device: [0:1:0] HL-DT-ST DVDRAM GH24NS95 RN01 (E:) (ATA)
I 11:08:36 Source Media Type: DVD-ROM (Book Type: DVD-ROM)
I 11:08:36 Source Media Supported Read Speeds: 4x; 6x
I 11:08:36 Source Media Sectors: 4.095.910 (Track Path: OTP - L0: 2.053.216 - L1: 2.042.694)
I 11:08:36 Source Media Size: 8.388.423.680 bytes
I 11:08:36 Verify Against Image File: No
I 11:08:36 Read Speed (Data/Audio): MAX / MAX
I 11:08:37 Read Speed - Effective: 2,5x - 6x; 6x - 2,5x
I 11:09:21 Verifying Session 1 of 1... (1 Track, LBA: 0 - 4095909)
I 11:09:21 Verifying Track 1 of 1... (MODE1/2048, LBA: 0 - 4095909)
Focus on the sentences I marked in black. It says that the media only supports read speeds of 4 and 6 x, but that´s impossible! I have just copied this same disc in other drive and I got an average speed of 12 X, and I also have a similar speed while dumping it with the drive I am having problem with (as I mentioned that it works fast sometimes). Something weird is going on.
EDIT2: I have just inserted a brand new PS2 disc and this is the information in IMGBURNS Information box
Disc Information:
Status: Complete
State of Last Session: Complete
Erasable: No
Sessions: 1
Sectors: 1.485.584
Size: 3.042.476.032 bytes
Time: 330:09:59 (MM:SS:FF)
Supported Read Speeds: 4x; 6x; 8x; 10x; 12x; 14x; 16x
Current Read Speed: 2,5x - 6x
What does it mean by current Speed read?
According to its profile in Lg´s website
http://www.lg.com/us/burners-drives/lg-GH24NS95-internal-dvd-rewriter
The drive should be able to read DVDROM discs at 16x.
Different drives, different Crc, no read or verify errors
in ImgBurn Support
Posted · Edited by baronluigi
In this kind, the disc I am using as source is a retail pressed disk, not a burned disk.
I have made another copy, using another unprotected disk as well, and this time I have obtained the same CRC in both copies.