The dd command in SCO UnixWare operating system is primarily used for low-level copying and conversion of raw data. The command copies region of raw device files, backs up boot sector of your hard drive, and reads fixed data from some specific files. An error message after running the dd command mainly occurs due to various reasons like, file system corruption, operating system malfunction, virus attack, and more. In most of the above situations, the error message primarily results in inaccessibility of hard drive data. To overcome such data loss situations, the best option is to restore the data from an updated backup. But, in case of absence of an updated backup or backup falling short of restoring the required information, you will need to use advanced SCO UnixWare Data Recovery application that can recover your lost data.
As a practical instance, you encounter the below error message, when you run the dd command to backup boot sector of your hard drive:
“# ll dm_vfrud_dsp.dbf
-rw-r—– 1 oracle dba 4294975488 Oct 15 15:23 dm_vfrud_dsp.dbf
# dd if=dm_vfrud_dsp.dbf of=/dev/null bs=512
dd read error: Invalid argument
0+0 records in
0+0 records out”
After the above error message appears, the dd command stops. Furthermore, the hard drive becomes unmountable making all the hard drive inaccessible.
Cause:
The primary reason for the occurrence of the above error message is the VxFS corruption.
Resolution:
To troubleshoot and resolve the above error message, the best way is to reinstall SCO UnixWare operating system. A clean reinstall of SCO UnixWare operating system will completely erase all the data stored on the hard drive partition or volume. For complete recovery of data after re-installation process is over, you will need to opt for advanced SCO UnixWare Data Recovery software. These recovery applications effectively scan the hard drive by using advance scanning algorithms to recover the lost information. With highly graphical and interactive user interface, these SCO UnixWare Recovery application is easy to understand and implement without any prior technical skills.
Stellar Phoenix (SCO UnixWare) Data Recovery software is the most trustworthy software that is compatible with VxFS [Veritas File System - VxFS1, VxFS2 & VxFS4] and UFS File systems. The read only SCO UnixWare Recovery software is designed for Windows 2003, XP, 2000, NT, ME, 98, and 95, and supports storage media like IDE, EIDE, and SCSI hard drives.
