Re: How to check if a DVD is damaged?
On Sat, 7 Jul 2007 21:30:01 + Manon Metten [EMAIL PROTECTED] wrote: Hello Manon, Even if GSpace is discontinued, I can download the uploaded data by accessing my gmail account. So, for a secondary backup, apart from backups on cd/dvd, it will do for me. And I cannot anticipate on Google (dis)continuing gmail etc. For the unlikely case that my house Not GMail, but they can disable the GSpace plugin, and (possibly) easy access to files other than mail. It's those issues that cause me concern. It takes away my control of the data. burns down and Google discontinuing gmail on the same day ... But then again, maybe tonight the ceiling will come down ... (if you know what I mean). :-)) Yes, the two things coinciding would be a 1 in a million chance. -- Regards _ / ) The blindingly obvious is / _)radnever immediately apparent The man in a tracksuit attacks me I Predict A Riot - Kaiser Chiefs signature.asc Description: PGP signature
Re: How to check if a DVD is damaged?
Hi Brad, On 7/8/07, Brad Rogers [EMAIL PROTECTED] wrote: Even if GSpace is discontinued, I can download the uploaded data by accessing my gmail account. So, for a secondary backup, apart from backups on cd/dvd, it will do for me. And I cannot anticipate on Google (dis)continuing gmail etc. For the unlikely case that my house Not GMail, but they can disable the GSpace plugin, and (possibly) easy access to files other than mail. It's those issues that cause me concern. It takes away my control of the data. Even if the GSpace plug-in will be disabled, I still have access to my data. To me GSpace is no more than a very handy tool to send messages with an attachment to myself (ie: using my gmail account to send mail to the same gmail account) accompanied by some meta data GSpace uses itself. Everything GSpace uploads appears as a normal e-mail (empty) with an attachment in my Inbox: the file GSpace uploaded. I really don't need GSpace to download that attachment but it's more much comfortable using GSpace than a mail client. But even without GSpace I have access to my account by simply logging in at gmail.google.com. Then I can then open the appropriate e-mail and simple download the attachment - et voilà. So for me, there's nothing to be worried about. The only thing of concern could be Google discontinuing GMail or maybe discarding all my mail. But I don't think that's likely to happen very soon. Greetings, Manon.
Re: How to check if a DVD is damaged?
On Sun, 8 Jul 2007 18:45:56 + Manon Metten [EMAIL PROTECTED] wrote: Hello Manon, Everything GSpace uploads appears as a normal e-mail (empty) with an Ah, I see. I don't know why, but I got the feeling that anything uploaded by the GSpace plugin would be handled differently, and would _not_ appear as an email. That was one of the reasons for my concerns. So for me, there's nothing to be worried about. The only thing of concern could be Google discontinuing GMail or maybe discarding all my mail. But I don't think that's likely to happen very soon. Shutting down GMail isn't likely, that's true. -- Regards _ / ) The blindingly obvious is / _)radnever immediately apparent We're going to hell anyway, let's travel first class Saturday Night - Kaiser Chiefs signature.asc Description: PGP signature
Re: How to check if a DVD is damaged?
On 4 Jul., 15:10, Rodolfo Medina [EMAIL PROTECTED] wrote: A few days ago I by chance realized that the DVD-RW I had used for months to do may backup was probably damaged: apparently it was not, because I could burn my data onto it without problems; but when I tried to copy its content into a hard disk I got I/O errors and some directories could not be copied. The problem disappeared when I changed the DVD with a brand new one, but now I feel not sure: how can I know when my actual backup DVD should in case be damaged as well? Is there any tool for that? Thanks for any reply, Rodolfo You might also want to have a look at dvdisaster (it is packaged in Debian). Not only can it tell you when a DVD starts to fail, it can usually recover the data for you (by use of separately-stored checksum information). -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: How to check if a DVD is damaged?
On Sun, 8 Jul 2007 18:45:56 + Manon Metten [EMAIL PROTECTED] wrote: [snip] GSpace than a mail client. But even without GSpace I have access to my account by simply logging in at gmail.google.com. Then I can then open the Or even more simply at 'gmail.com' :) Greetings, Manon. Celejar -- mailmin.sourceforge.net - remote access via secure (OpenPGP) email ssuds.sourceforge.net - A Simple Sudoku Solver and Generator -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: How to check if a DVD is damaged?
On 4 Jul., 15:10, Rodolfo Medina [EMAIL PROTECTED] wrote: A few days ago I by chance realized that the DVD-RW I had used for months to do may backup was probably damaged: apparently it was not, because I could burn my data onto it without problems; but when I tried to copy its content into a hard disk I got I/O errors and some directories could not be copied. The problem disappeared when I changed the DVD with a brand new one, but now I feel not sure: how can I know when my actual backup DVD should in case be damaged as well? Is there any tool for that? Many thanks to all that provided their help. Mostly I found easy to use Thomas' suggestion: Thomas Hoppeer [EMAIL PROTECTED] writes: To verify data on your dvd you can also use star and readcd: http://www.linuxconfig.org/Create_and_burn_ISO_images_with_mkisofs_%26_cdrecord#Verify_data . Now, `readcd' would produce I/O error messages with *all* DVDs, also the ones that I know for sure are all right. So, it was actually not useful at all. Instead, `star' seems to do the proper job: with Sarge I did: # apt-get install star , then mounted the disk, then cd into it and: $ star -cPM . /dev/null . With the damaged disk, it produced an output like: star: Input/output error. Error reading 'rodolfo-30.giu.2007/mobile/opensync/libsyncml/tests/.svn/README.txt'. , then ended up with: star: 118167 blocks + 5120 bytes (total of 1210035200 bytes = 1181675.00k). star: The following problems occurred during archive processing: star: Cannot: stat 0, open 0, read/write 662. Size changed 0. star: Missing links 0, Name too long 0, File too big 0, Not dumped 0. star: Processed all possible files, despite earlier errors. . Instead, with the brand new DVD the output was: star: 119837 blocks + 9216 bytes (total of 1227140096 bytes = 1198379.00k). . So it seems that I can use this tool to verify disk integrity. I didn't try other people suggestions because this one was the simplest for me. Only one thing: the command `apt-get install star' does not work with Etch: it knows no package named `star'. Any suggestion about how to install star under Etch? Thanks indeed, Rodolfo -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: How to check if a DVD is damaged?
On 7/7/07, Rodolfo Medina [EMAIL PROTECTED] wrote: Many thanks to all that provided their help. Mostly I found easy to use Thomas' suggestion: Thomas Hoppeer [EMAIL PROTECTED] writes: To verify data on your dvd you can also use star and readcd: http://www.linuxconfig.org/Create_and_burn_ISO_images_with_mkisofs_%26_cdrecord#Verify_data . Now, `readcd' would produce I/O error messages with *all* DVDs, also the ones that I know for sure are all right. So, it was actually not useful at all. Instead, `star' seems to do the proper job: with Sarge I did: # apt-get install star , then mounted the disk, then cd into it and: $ star -cPM . /dev/null . With the damaged disk, it produced an output like: star: Input/output error. Error reading 'rodolfo-30.giu.2007/mobile/opensync/libsyncml/tests/.svn/README.txt'. , then ended up with: star: 118167 blocks + 5120 bytes (total of 1210035200 bytes = 1181675.00k). star: The following problems occurred during archive processing: star: Cannot: stat 0, open 0, read/write 662. Size changed 0. star: Missing links 0, Name too long 0, File too big 0, Not dumped 0. star: Processed all possible files, despite earlier errors. . Instead, with the brand new DVD the output was: star: 119837 blocks + 9216 bytes (total of 1227140096 bytes = 1198379.00k). . So it seems that I can use this tool to verify disk integrity. I didn't try other people suggestions because this one was the simplest for me. Only one thing: the command `apt-get install star' does not work with Etch: it knows no package named `star'. Any suggestion about how to install star under Etch? Thanks indeed, Rodolfo for me in etch apt-get install star works. lvgvaio:~# apt-get install star Reading package lists... Done Building dependency tree... Done The following NEW packages will be installed: star 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 298kB of archives. After unpacking 651kB of additional disk space will be used. Get:1 http://ftp.us.debian.org etch/main star 1.5a67-1 [298kB] Fetched 298kB in 0s (491kB/s) Selecting previously deselected package star. (Reading database ... 110520 files and directories currently installed.) Unpacking star (from .../star_1.5a67-1_i386.deb) ... Setting up star (1.5a67-1) ... -- L.V.Gandhi http://lvgandhi.tripod.com/ linux user No.205042 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: How to check if a DVD is damaged?
Hi Rodolfo, On 7/4/07, Rodolfo Medina [EMAIL PROTECTED] wrote: A few days ago I by chance realized that the DVD-RW I had used for months to do may backup was probably damaged: apparently it was not, because I could burn my data onto it without problems; but when I tried to copy its content into a hard disk I got I/O errors and some directories could not be copied. I've had this very same problem with cheap CD's that I used for backup. Making a backup proceeded without any error, but when I tried to access the data, I also got r/w errors, resulting in not being able to access the data anymore. I trashed all these cheap CD's and turned to quality CD's (in my case Verbatim 32x). Then for months I checked all data on CD after making a backup, but I didn't encounter a single error anymore. I stick to Verbatim only for backup. Manon.
Re: How to check if a DVD is damaged?
On Sat, 7 Jul 2007 19:46:27 + Manon Metten [EMAIL PROTECTED] wrote: Hello Manon, Then for months I checked all data on CD after making a backup, but I didn't encounter a single error anymore. I stick to Verbatim only for backup. When backing up to CD, my preference is to make two copies. On disks from two different (but high quality) companies. That way, I hope I greatly reduce the risk of suffering problems from a bad batch of disks. At least one of those disks is kept off site, too; It's pointless having backups next to a computer that gets burnt in a fire. -- Regards _ / ) The blindingly obvious is / _)radnever immediately apparent Walking through town is quite scary I Predict A Riot - Kaiser Chiefs signature.asc Description: PGP signature
Re: How to check if a DVD is damaged?
Hi Brad, On 7/7/07, Brad Rogers [EMAIL PROTECTED] wrote: When backing up to CD, my preference is to make two copies. On disks from two different (but high quality) companies. That way, I hope I greatly reduce the risk of suffering problems from a bad batch of disks. At least one of those disks is kept off site, too; It's pointless having backups next to a computer that gets burnt in a fire. Right. You could also consider using GSpace. That's what I do with some data I really don't wanna lose. I encrypt it with GPG and just upload it to my gmail account. ATM it has a capacity of 2,8 GB per account. And you can have as many gmail accounts as you want. Just open a gmail account (gmail.google.com) and install the GSpace plug-in for Iceweasel. Then you can upload files to your account just as easily as copying files on your HD. Manon.
Re: How to check if a DVD is damaged?
On Sat, 7 Jul 2007 20:46:06 + Manon Metten [EMAIL PROTECTED] wrote: Hello Manon, Right. You could also consider using GSpace. That's what I do with You are joking, right? GSpace depends *entirely* on the goodwill of Google. GSpace isn't endorsed by Google, and can disappear without warning, if Google make any (un)suitable changes to their system. Even the people that created it don't place that much faith in it. This taken from their Legal issues; quote This extension may be discontinued at any point. we shall not be held responsible for the discontinuation of this extention. /quote For that reason alone I wouldn't consider it even as a tertiary backup. It wouldn't be quite so bad if it were a paid for solution, but even they are subject to problems of control. Or rather, lack of it, from the user's point of view. -- Regards _ / ) The blindingly obvious is / _)radnever immediately apparent A friend of a friend he got beaten I Predict A Riot - Kaiser Chiefs signature.asc Description: PGP signature
Re: How to check if a DVD is damaged?
Hi Brad, On 7/7/07, Brad Rogers [EMAIL PROTECTED] wrote: Right. You could also consider using GSpace. That's what I do with You are joking, right? GSpace depends *entirely* on the goodwill of Google. GSpace isn't endorsed by Google, and can disappear without warning, if Google make any (un)suitable changes to their system. Even the people that created it don't place that much faith in it. This taken from their Legal issues; quote This extension may be discontinued at any point. we shall not be held responsible for the discontinuation of this extention. /quote For that reason alone I wouldn't consider it even as a tertiary backup. Even if GSpace is discontinued, I can download the uploaded data by accessing my gmail account. So, for a secondary backup, apart from backups on cd/dvd, it will do for me. And I cannot anticipate on Google (dis)continuing gmail etc. For the unlikely case that my house burns down and Google discontinuing gmail on the same day ... But then again, maybe tonight the ceiling will come down ... (if you know what I mean). Manon.
Re: How to check if a DVD is damaged?
On Wed, Jul 04, 2007 at 03:01:16PM +0200, Rodolfo Medina wrote: A few days ago I by chance realized that the DVD-RW I had used for months to do may backup was probably damaged: apparently it was not, because I could burn my data onto it without problems; but when I tried to copy its content into a hard disk I got I/O errors and some directories could not be copied. The problem disappeared when I changed the DVD with a brand new one, but now I feel not sure: how can I know when my actual backup DVD should in case be damaged as well? Is there any tool for that? Look at cdck. The procedure I use is to verify the burn (I happen to use K3B which has a verify option) which calculates the md5sum of the image file and the CD/DVD and compares them. Then I use cdck to do finer-grained testing. Here's the readme for cdck: CD/DVD check tools == Actually cdck is a simple program to verify CD/DVD quality. The known fact is that even if all files on the disc are readable, some sectors having bad timing can easily turn into unreadable ones in the future. To get an idea about disc cdck reads it sector by sector, keeping all reading timings and then tells you its verdict. Optionally it can write timing table into text file usable by gnuplot(1) program, so you can draw some graphs out of it. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: How to check if a DVD is damaged?
To verify data on your dvd you can also use star and readcd: http://www.linuxconfig.org/Create_and_burn_ISO_images_with_mkisofs_%26_cdrecord#Verify_data hope this helps On 7/5/07, Douglas Allan Tutty [EMAIL PROTECTED] wrote: On Wed, Jul 04, 2007 at 03:01:16PM +0200, Rodolfo Medina wrote: A few days ago I by chance realized that the DVD-RW I had used for months to do may backup was probably damaged: apparently it was not, because I could burn my data onto it without problems; but when I tried to copy its content into a hard disk I got I/O errors and some directories could not be copied. The problem disappeared when I changed the DVD with a brand new one, but now I feel not sure: how can I know when my actual backup DVD should in case be damaged as well? Is there any tool for that? Look at cdck. The procedure I use is to verify the burn (I happen to use K3B which has a verify option) which calculates the md5sum of the image file and the CD/DVD and compares them. Then I use cdck to do finer-grained testing. Here's the readme for cdck: CD/DVD check tools == Actually cdck is a simple program to verify CD/DVD quality. The known fact is that even if all files on the disc are readable, some sectors having bad timing can easily turn into unreadable ones in the future. To get an idea about disc cdck reads it sector by sector, keeping all reading timings and then tells you its verdict. Optionally it can write timing table into text file usable by gnuplot(1) program, so you can draw some graphs out of it. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED] -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
How to check if a DVD is damaged?
A few days ago I by chance realized that the DVD-RW I had used for months to do may backup was probably damaged: apparently it was not, because I could burn my data onto it without problems; but when I tried to copy its content into a hard disk I got I/O errors and some directories could not be copied. The problem disappeared when I changed the DVD with a brand new one, but now I feel not sure: how can I know when my actual backup DVD should in case be damaged as well? Is there any tool for that? Thanks for any reply, Rodolfo -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: How to check if a DVD is damaged?
On 4 Jul., 15:10, Rodolfo Medina [EMAIL PROTECTED] wrote: A few days ago I by chance realized that the DVD-RW I had used for months to do may backup was probably damaged: apparently it was not, because I could burn my data onto it without problems; but when I tried to copy its content into a hard disk I got I/O errors and some directories could not be copied. The problem disappeared when I changed the DVD with a brand new one, but now I feel not sure: how can I know when my actual backup DVD should in case be damaged as well? Is there any tool for that? Thanks for any reply, Rodolfo I dont know the way that you use for your backup. If you create an iso file before burning it you could use checksums to compare the data on your disk and the data on your DVD. Simply mount that iso, create a file with md5sum which contains a sum for every file inside the iso. Than burn your backup and compare the disk's content with your checksum file. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: How to check if a DVD is damaged?
On 4 Jul., 15:10, Rodolfo Medina [EMAIL PROTECTED] wrote: A few days ago I by chance realized that the DVD-RW I had used for months to do may backup was probably damaged: apparently it was not, because I could burn my data onto it without problems; but when I tried to copy its content into a hard disk I got I/O errors and some directories could not be copied. The problem disappeared when I changed the DVD with a brand new one, but now I feel not sure: how can I know when my actual backup DVD should in case be damaged as well? Is there any tool for that? Thanks for any reply, Rodolfo I dont know the way that you use for your backup. If you create an iso file before burning it you could use checksums to compare the data on your disk and the data on your DVD. Simply mount that iso, create a file with md5sum which contains a sum for every file inside the iso. Than burn your backup and compare the disk's content with your checksum file. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: How to check if a DVD is damaged?
On 7/4/07, Rodolfo Medina [EMAIL PROTECTED] wrote: A few days ago I by chance realized that the DVD-RW I had used for months to do may backup was probably damaged: apparently it was not, because I could burn my data onto it without problems; but when I tried to copy its content into a hard disk I got I/O errors and some directories could not be copied. The problem disappeared when I changed the DVD with a brand new one, but now I feel not sure: how can I know when my actual backup DVD should in case be damaged as well? Is there any tool for that? K3b has an option to verify if original data matches the copy. This takes far longer than just burning of course; maybe twice as long. -- my place on the web: floss-and-misc.blogspot.com -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: How to check if a DVD is damaged?
Tshepang Lekhonkhobe wrote: On 7/4/07, Rodolfo Medina [EMAIL PROTECTED] wrote: A few days ago I by chance realized that the DVD-RW I had used for months to do may backup was probably damaged: apparently it was not, because I could burn my data onto it without problems; but when I tried to copy its content into a hard disk I got I/O errors and some directories could not be copied. The problem disappeared when I changed the DVD with a brand new one, but now I feel not sure: how can I know when my actual backup DVD should in case be damaged as well? Is there any tool for that? K3b has an option to verify if original data matches the copy. This takes far longer than just burning of course; maybe twice as long. CD-Writing HOWTO: dd if=/dev/scd0 of=cdimage. This command reads the content of the CD-ROM from SCSI CD-writers are slightly easier to set up with regard to CD-writing ... tldp.org/HOWTO/CD-Writing-HOWTO-4.html - 24k - Cached - Similar pages Then you can compare the iso image you wrote to DVD with the iso image you got back from dd best regards Morten -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
