Can I recover a single partition with ddrescue?
up vote
0
down vote
favorite
I have a failed hdd (seagate 1Tb) with bad sector.
I want to make an image of it with ddrescue. The problem is that I don't have a 1tb hdd to put the image on.
The files that I have to rescue are just 90gb. So. Can I shrink the hdd and use ddrescue on one partition so the result image is of 100gb maximum?
linux external-hard-drive dd ddrescue
asked Dec 5 at 9:23
Psygno
61
add a comment |
up vote
0
down vote
favorite
I have a failed hdd (seagate 1Tb) with bad sector.
I want to make an image of it with ddrescue. The problem is that I don't have a 1tb hdd to put the image on.
The files that I have to rescue are just 90gb. So. Can I shrink the hdd and use ddrescue on one partition so the result image is of 100gb maximum?
linux external-hard-drive dd ddrescue
asked Dec 5 at 9:23
Psygno
61
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have a failed hdd (seagate 1Tb) with bad sector.
I want to make an image of it with ddrescue. The problem is that I don't have a 1tb hdd to put the image on.
The files that I have to rescue are just 90gb. So. Can I shrink the hdd and use ddrescue on one partition so the result image is of 100gb maximum?
linux external-hard-drive dd ddrescue
asked Dec 5 at 9:23
Psygno
61
I have a failed hdd (seagate 1Tb) with bad sector.
I want to make an image of it with ddrescue. The problem is that I don't have a 1tb hdd to put the image on.
The files that I have to rescue are just 90gb. So. Can I shrink the hdd and use ddrescue on one partition so the result image is of 100gb maximum?
linux external-hard-drive dd ddrescue
linux external-hard-drive dd ddrescue
asked Dec 5 at 9:23
Psygno
61
asked Dec 5 at 9:23
Psygno
61
asked Dec 5 at 9:23
Psygno
61
asked Dec 5 at 9:23
Psygno
61
asked Dec 5 at 9:23
Psygno
61
61
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
up vote
0
down vote
Is the drive still actively failing, getting worse, making weird noises, etc?
If not, and it's still readable (aside from a single bad sector) and mountable, why not just quickly mount it read-only / ro (don't boot from it) and copy the files you want. Or if it's not mountable, use a program like testdisk that might be able to copy only a few files. Or maybe photorec, though it tries to read an entire device but only saves the found files.
If the drive does sound bad and has errors all over the place, you should really get another backup drive that's big enough to store the image, see Why is it impossible to compress on the fly images by ddrescue? If you want the entire drive, you'll just have to beg/borrow/buy a big enough drive, even just for a few hours. You can compress the image after ddrescue is finished creating it, but watch out for compression that doesn't allow on-the-fly access like gz, xz, etc... squashfs might work.
Or maybe you're in luck and the single partition you want to backup is small enough for your storage, after all it can't be any larger than the entire drive.
answered Dec 5 at 12:25
Xen2050
9,86931536
I tried and it worked (copy on read only) but some of my pics are broken I just thought that ddrescue could at least save some of them. One time it did it. One last thing: you talk about partition, so you think I could make a partition and do a ddrescue that output an image that is big as the partition and not as the entire disk? Maybe I didn't understand (the failed drive was almost full before the failing but I menage do delete many useless thing because I thought that ddrescue didn't look for them)
– Psygno
Dec 6 at 8:39
The partitions are a fixed size, resizing or moving one usually needs a lot of reads & writes, you don't want to do that before copying all your data, if the drive is failing. gnome-disk-utility or gparted orfdisk -lshow partition sizes nicely, they're they the 1, 2, 3... devices in/dev/sda1,/dev/sda2while the entire drive is just/dev/sda. If you only want data from/dev/sda2you could ignore the other partitions. ddrescue just reads every sector or a device (drive or partition), free space and files alike. Photorec only tries to read data... but if the files are corrupted...
– Xen2050
Dec 6 at 10:37
add a comment |
up vote
0
down vote
Maybe you can compress the image on-the-fly by piping to gzip or other compression? https://serverfault.com/questions/52260/compressing-dd-backup-on-the-fly
Something like
sudo bash -c "dd if=/dev/sda2 | gzip > /media/disk/sda2-backup-11december18.gz"
answered Dec 5 at 9:32
manscher
12
Welcome to Super User! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.
– bertieb
Dec 5 at 9:37
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
Is the drive still actively failing, getting worse, making weird noises, etc?
If not, and it's still readable (aside from a single bad sector) and mountable, why not just quickly mount it read-only / ro (don't boot from it) and copy the files you want. Or if it's not mountable, use a program like testdisk that might be able to copy only a few files. Or maybe photorec, though it tries to read an entire device but only saves the found files.
If the drive does sound bad and has errors all over the place, you should really get another backup drive that's big enough to store the image, see Why is it impossible to compress on the fly images by ddrescue? If you want the entire drive, you'll just have to beg/borrow/buy a big enough drive, even just for a few hours. You can compress the image after ddrescue is finished creating it, but watch out for compression that doesn't allow on-the-fly access like gz, xz, etc... squashfs might work.
Or maybe you're in luck and the single partition you want to backup is small enough for your storage, after all it can't be any larger than the entire drive.
answered Dec 5 at 12:25
Xen2050
9,86931536
I tried and it worked (copy on read only) but some of my pics are broken I just thought that ddrescue could at least save some of them. One time it did it. One last thing: you talk about partition, so you think I could make a partition and do a ddrescue that output an image that is big as the partition and not as the entire disk? Maybe I didn't understand (the failed drive was almost full before the failing but I menage do delete many useless thing because I thought that ddrescue didn't look for them)
– Psygno
Dec 6 at 8:39
The partitions are a fixed size, resizing or moving one usually needs a lot of reads & writes, you don't want to do that before copying all your data, if the drive is failing. gnome-disk-utility or gparted orfdisk -lshow partition sizes nicely, they're they the 1, 2, 3... devices in/dev/sda1,/dev/sda2while the entire drive is just/dev/sda. If you only want data from/dev/sda2you could ignore the other partitions. ddrescue just reads every sector or a device (drive or partition), free space and files alike. Photorec only tries to read data... but if the files are corrupted...
– Xen2050
Dec 6 at 10:37
add a comment |
up vote
0
down vote
Is the drive still actively failing, getting worse, making weird noises, etc?
If not, and it's still readable (aside from a single bad sector) and mountable, why not just quickly mount it read-only / ro (don't boot from it) and copy the files you want. Or if it's not mountable, use a program like testdisk that might be able to copy only a few files. Or maybe photorec, though it tries to read an entire device but only saves the found files.
If the drive does sound bad and has errors all over the place, you should really get another backup drive that's big enough to store the image, see Why is it impossible to compress on the fly images by ddrescue? If you want the entire drive, you'll just have to beg/borrow/buy a big enough drive, even just for a few hours. You can compress the image after ddrescue is finished creating it, but watch out for compression that doesn't allow on-the-fly access like gz, xz, etc... squashfs might work.
Or maybe you're in luck and the single partition you want to backup is small enough for your storage, after all it can't be any larger than the entire drive.
answered Dec 5 at 12:25
Xen2050
9,86931536
I tried and it worked (copy on read only) but some of my pics are broken I just thought that ddrescue could at least save some of them. One time it did it. One last thing: you talk about partition, so you think I could make a partition and do a ddrescue that output an image that is big as the partition and not as the entire disk? Maybe I didn't understand (the failed drive was almost full before the failing but I menage do delete many useless thing because I thought that ddrescue didn't look for them)
– Psygno
Dec 6 at 8:39
The partitions are a fixed size, resizing or moving one usually needs a lot of reads & writes, you don't want to do that before copying all your data, if the drive is failing. gnome-disk-utility or gparted orfdisk -lshow partition sizes nicely, they're they the 1, 2, 3... devices in/dev/sda1,/dev/sda2while the entire drive is just/dev/sda. If you only want data from/dev/sda2you could ignore the other partitions. ddrescue just reads every sector or a device (drive or partition), free space and files alike. Photorec only tries to read data... but if the files are corrupted...
– Xen2050
Dec 6 at 10:37
add a comment |
up vote
0
down vote
up vote
0
down vote
Is the drive still actively failing, getting worse, making weird noises, etc?
If not, and it's still readable (aside from a single bad sector) and mountable, why not just quickly mount it read-only / ro (don't boot from it) and copy the files you want. Or if it's not mountable, use a program like testdisk that might be able to copy only a few files. Or maybe photorec, though it tries to read an entire device but only saves the found files.
If the drive does sound bad and has errors all over the place, you should really get another backup drive that's big enough to store the image, see Why is it impossible to compress on the fly images by ddrescue? If you want the entire drive, you'll just have to beg/borrow/buy a big enough drive, even just for a few hours. You can compress the image after ddrescue is finished creating it, but watch out for compression that doesn't allow on-the-fly access like gz, xz, etc... squashfs might work.
Or maybe you're in luck and the single partition you want to backup is small enough for your storage, after all it can't be any larger than the entire drive.
answered Dec 5 at 12:25
Xen2050
9,86931536
Is the drive still actively failing, getting worse, making weird noises, etc?
If not, and it's still readable (aside from a single bad sector) and mountable, why not just quickly mount it read-only / ro (don't boot from it) and copy the files you want. Or if it's not mountable, use a program like testdisk that might be able to copy only a few files. Or maybe photorec, though it tries to read an entire device but only saves the found files.
If the drive does sound bad and has errors all over the place, you should really get another backup drive that's big enough to store the image, see Why is it impossible to compress on the fly images by ddrescue? If you want the entire drive, you'll just have to beg/borrow/buy a big enough drive, even just for a few hours. You can compress the image after ddrescue is finished creating it, but watch out for compression that doesn't allow on-the-fly access like gz, xz, etc... squashfs might work.
Or maybe you're in luck and the single partition you want to backup is small enough for your storage, after all it can't be any larger than the entire drive.
answered Dec 5 at 12:25
Xen2050
9,86931536
answered Dec 5 at 12:25
Xen2050
9,86931536
answered Dec 5 at 12:25
Xen2050
9,86931536
answered Dec 5 at 12:25
Xen2050
9,86931536
9,86931536
I tried and it worked (copy on read only) but some of my pics are broken I just thought that ddrescue could at least save some of them. One time it did it. One last thing: you talk about partition, so you think I could make a partition and do a ddrescue that output an image that is big as the partition and not as the entire disk? Maybe I didn't understand (the failed drive was almost full before the failing but I menage do delete many useless thing because I thought that ddrescue didn't look for them)
– Psygno
Dec 6 at 8:39
The partitions are a fixed size, resizing or moving one usually needs a lot of reads & writes, you don't want to do that before copying all your data, if the drive is failing. gnome-disk-utility or gparted orfdisk -lshow partition sizes nicely, they're they the 1, 2, 3... devices in/dev/sda1,/dev/sda2while the entire drive is just/dev/sda. If you only want data from/dev/sda2you could ignore the other partitions. ddrescue just reads every sector or a device (drive or partition), free space and files alike. Photorec only tries to read data... but if the files are corrupted...
– Xen2050
Dec 6 at 10:37
add a comment |
I tried and it worked (copy on read only) but some of my pics are broken I just thought that ddrescue could at least save some of them. One time it did it. One last thing: you talk about partition, so you think I could make a partition and do a ddrescue that output an image that is big as the partition and not as the entire disk? Maybe I didn't understand (the failed drive was almost full before the failing but I menage do delete many useless thing because I thought that ddrescue didn't look for them)
– Psygno
Dec 6 at 8:39
The partitions are a fixed size, resizing or moving one usually needs a lot of reads & writes, you don't want to do that before copying all your data, if the drive is failing. gnome-disk-utility or gparted orfdisk -lshow partition sizes nicely, they're they the 1, 2, 3... devices in/dev/sda1,/dev/sda2while the entire drive is just/dev/sda. If you only want data from/dev/sda2you could ignore the other partitions. ddrescue just reads every sector or a device (drive or partition), free space and files alike. Photorec only tries to read data... but if the files are corrupted...
– Xen2050
Dec 6 at 10:37
I tried and it worked (copy on read only) but some of my pics are broken I just thought that ddrescue could at least save some of them. One time it did it. One last thing: you talk about partition, so you think I could make a partition and do a ddrescue that output an image that is big as the partition and not as the entire disk? Maybe I didn't understand (the failed drive was almost full before the failing but I menage do delete many useless thing because I thought that ddrescue didn't look for them)
– Psygno
Dec 6 at 8:39
I tried and it worked (copy on read only) but some of my pics are broken I just thought that ddrescue could at least save some of them. One time it did it. One last thing: you talk about partition, so you think I could make a partition and do a ddrescue that output an image that is big as the partition and not as the entire disk? Maybe I didn't understand (the failed drive was almost full before the failing but I menage do delete many useless thing because I thought that ddrescue didn't look for them)
– Psygno
Dec 6 at 8:39
The partitions are a fixed size, resizing or moving one usually needs a lot of reads & writes, you don't want to do that before copying all your data, if the drive is failing. gnome-disk-utility or gparted or
fdisk -l show partition sizes nicely, they're they the 1, 2, 3... devices in /dev/sda1, /dev/sda2 while the entire drive is just /dev/sda. If you only want data from /dev/sda2 you could ignore the other partitions. ddrescue just reads every sector or a device (drive or partition), free space and files alike. Photorec only tries to read data... but if the files are corrupted...– Xen2050
Dec 6 at 10:37
The partitions are a fixed size, resizing or moving one usually needs a lot of reads & writes, you don't want to do that before copying all your data, if the drive is failing. gnome-disk-utility or gparted or
fdisk -l show partition sizes nicely, they're they the 1, 2, 3... devices in /dev/sda1, /dev/sda2 while the entire drive is just /dev/sda. If you only want data from /dev/sda2 you could ignore the other partitions. ddrescue just reads every sector or a device (drive or partition), free space and files alike. Photorec only tries to read data... but if the files are corrupted...– Xen2050
Dec 6 at 10:37
add a comment |
up vote
0
down vote
Maybe you can compress the image on-the-fly by piping to gzip or other compression? https://serverfault.com/questions/52260/compressing-dd-backup-on-the-fly
Something like
sudo bash -c "dd if=/dev/sda2 | gzip > /media/disk/sda2-backup-11december18.gz"
answered Dec 5 at 9:32
manscher
12
Welcome to Super User! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.
– bertieb
Dec 5 at 9:37
add a comment |
up vote
0
down vote
Maybe you can compress the image on-the-fly by piping to gzip or other compression? https://serverfault.com/questions/52260/compressing-dd-backup-on-the-fly
Something like
sudo bash -c "dd if=/dev/sda2 | gzip > /media/disk/sda2-backup-11december18.gz"
answered Dec 5 at 9:32
manscher
12
Welcome to Super User! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.
– bertieb
Dec 5 at 9:37
add a comment |
up vote
0
down vote
up vote
0
down vote
Maybe you can compress the image on-the-fly by piping to gzip or other compression? https://serverfault.com/questions/52260/compressing-dd-backup-on-the-fly
Something like
sudo bash -c "dd if=/dev/sda2 | gzip > /media/disk/sda2-backup-11december18.gz"
answered Dec 5 at 9:32
manscher
12
Maybe you can compress the image on-the-fly by piping to gzip or other compression? https://serverfault.com/questions/52260/compressing-dd-backup-on-the-fly
Something like
sudo bash -c "dd if=/dev/sda2 | gzip > /media/disk/sda2-backup-11december18.gz"
answered Dec 5 at 9:32
manscher
12
edited Dec 11 at 9:14
answered Dec 5 at 9:32
manscher
12
answered Dec 5 at 9:32
manscher
12
answered Dec 5 at 9:32
manscher
12
12
Welcome to Super User! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.
– bertieb
Dec 5 at 9:37
add a comment |
Welcome to Super User! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.
– bertieb
Dec 5 at 9:37
Welcome to Super User! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.
– bertieb
Dec 5 at 9:37
Welcome to Super User! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.
– bertieb
Dec 5 at 9:37
add a comment |
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