Sponsored Content
Operating Systems Linux recover deleted files from memory stick Post 88525 by mr_manny on Saturday 5th of November 2005 12:22:20 PM
Old 11-05-2005
found these OLD notes on a process I successfully used ONCE.

hope it helps,
manny

Pretty much most of the answers have been for users of Win32 operating systems, so I'll post a little note here about howto recover corrupted JPEG files from compact flash here for Linux or UNIX users.

Step 1: load the CF card as a read-only filesystem. A number of options exist. Linux, for example, supports many cameras through the usb-storage.o driver. You simpy connect the USB cable from the workstation to the camera, turn on the camera, and then try to mount the CF card as a filesystem. The usb-storage.o driver will usually use SCSI emulation and present the drive as /dev/sda1 or some number. On Linux 2.4.x kernels, look in the /var/log/messages file for a line containing "kernel: sda: sda1" or something similar.

For laptop users, one may still connect using USB on newer laptops, but more commonly, one uses a PCMCIA adaptor card for CF. These are relatively cheap - around $14 in 2002 when I bought them. The CF card slides into the PCMCIA adapter and the whole unit pops into the laptop. If audio notifications on the PCMCIA driver were enabled, one should hear two positive "beeps". This means that the CF card should now be recognized as drive /dev/hde1 (again, see messages file for actual device name)

Step 2: Mount the filesystem read-only at first and just do a directory listing to see if Linux recognizes files that the camera or plain win32 won't see. This can be done by creating the mount point and mounting the filesystem:

# mkdir /mnt/cflash # mount -t vfab -o ro /dev/hde1 /mnt/cflash

Step 3: If the images are present and can be copied to disk, do so at this point and finish. Otherwise, we'll need to do a full filesystem dump of contents into a file and then run a jpeg extraction utility to parse and extract jpeg files for the flash image on disk. To do the dump on UNIX, use the 'dd' command.

# dd flash.img

This should produce a dump of the entire contents of the flash ram to disk file.

Step 4: The final step requires one to download a DOS utility called "jpegdump" found at http://www.goto.onlinehome.de/dsc/jpegdump.htm and then running it under the Linux Wine (Windoze Emulator) utility.

# wine -- jpegdump -recover flash.img

In the currect working directory, the jpegdump extracts out a large number of ordered JPG files. I hope this helps. And Linux rocks. The 'dd' utility combined with Wine running jpegdump in emulation works beautifully. I was able to recover all 32 MB of stored JPEGs

recovered with following:

wine -- jpegdump.exe -recover c:\dianesPICSdd.img


this created recoverred jpg files under the wine windows directory...
 

7 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Recover deleted files

Is there a Unix tool, like in Novell, to recover accidentally deleted files? (2 Replies)
Discussion started by: kuultak
2 Replies

2. AIX

recover deleted files

How to recover deleted files in AIX ? (1 Reply)
Discussion started by: vjm
1 Replies

3. Shell Programming and Scripting

Is there a way to recover files deleted using rm command???

Hi All, I just mistakingly deleted some files using rm command.Is there a way to get it back?i work on Solaris 10 Thanks, Kumar (1 Reply)
Discussion started by: kumarsaravana_s
1 Replies

4. UNIX for Dummies Questions & Answers

how to recover deleted files in unix

Hi Experts, by mistake i deleted some files that are very important to the project. is there any way that i can recover those files,there is no backup for that but the details of the file we know. This will be a great help. Thanks (5 Replies)
Discussion started by: namishtiwari
5 Replies

5. Shell Programming and Scripting

Need to Recover Deleted Files

Hi, By mistake, executed the following command : rm -rf * and ALL files got deleted. But I need to get back these files as they are very very important. Please help me how to recover this file. Its Urgent for me please. Thanks in advance. (6 Replies)
Discussion started by: unx100
6 Replies

6. Red Hat

Recover deleted files from linux server machine..

Hi, I am working Linux server machine. Somebody by mistake(or may be knowingly) deleted few folders and files from the machine. How is this possible to recover those files and folders????:confused: I normally logged in through Putty and winscp only. And don't have any history for putty... (8 Replies)
Discussion started by: pamu
8 Replies

7. Linux

Recover deleted files on Linux server

Hi Guys, Greetings!. I have executed the cronjob that runs the shell script which is in directory.When the cronjob was executed , I found that the directory where the script resides has got deleted. Note: The directory was deleted with other use not root user. The... (9 Replies)
Discussion started by: reminisce
9 Replies
xfs_freeze(8)						      System Manager's Manual						     xfs_freeze(8)

NAME
xfs_freeze - suspend access to an XFS filesystem SYNOPSIS
xfs_freeze -f | -u mount-point DESCRIPTION
xfs_freeze suspends and resumes access to an XFS filesystem (see xfs(5)). xfs_freeze halts new access to the filesystem and creates a stable image on disk. xfs_freeze is intended to be used with volume managers and hardware RAID devices that support the creation of snapshots. The mount-point argument is the pathname of the directory where the filesystem is mounted. The filesystem must be mounted to be frozen (see mount(8)). The -f flag requests the specified XFS filesystem to be frozen from new modifications. When this is selected, all ongoing transactions in the filesystem are allowed to complete, new write system calls are halted, other calls which modify the filesystem are halted, and all dirty data, metadata, and log information are written to disk. Any process attempting to write to the frozen filesystem will block waiting for the filesystem to be unfrozen. Note that even after freezing, the on-disk filesystem can contain information on files that are still in the process of unlinking. These files will not be unlinked until the filesystem is unfrozen or a clean mount of the snapshot is complete. The -u flag is used to un-freeze the filesystem and allow operations to continue. Any filesystem modifications that were blocked by the freeze are unblocked and allowed to complete. One of -f or -u must be supplied to xfs_freeze. NOTES
A copy of a frozen XFS filesystem will usually have the same universally unique identifier (UUID) as the original, and thus may be pre- vented from being mounted. The XFS nouuid mount option can be used to circumvent this issue. In Linux kernel version 2.6.29, the interface which XFS uses to freeze and unfreeze was elevated to the VFS, so that this tool can now be used on many other Linux filesystems. SEE ALSO
xfs(5), lvm(8), mount(8). xfs_freeze(8)
All times are GMT -4. The time now is 04:28 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy