QIC tape data recovery
 
Decrypting Sytos DC6525 Data Cartridges
A customer sent us a mixture of 60Mb and 150Mb QIC DC6525 tapes in CPIO, SYTOS and QTOS formats.  They were legacy tapes and although the user knew what information was stored on them, they could not give us any indication of the backup format or drives that wrote the tapes.  Given that the tapes are hardware specific and the QTOS backup was compressed, this was a testing conversion. 
To compund the issues we were already facing, there were numerous read errors scattered across the tapes and the SYTOS tapes versions 3.11 and earlier, were encrypted and oddly encoded.  Looking at the block headers, we could see that some of the tapes were also STAC compressed. SYTOS tape operating system version 3.11 was discontinued in 1990.   
 
With regards the Sytos Plus backup, quite a lot of work was required to get the files extracted and overcome the read errors. Getting the original software to process these tapes was not possible. We found that SytosPlus was very difficult to work with.  Hence, to extract the files we wrote a utility. Once extracted, we addressed the encryption. SYTOS encrypts the headers using a table look-up, which took days to decipher. For each character, we reverse engineered the code to interpret the files.  

Although the project took a number of weeks to overcome the complications, restoring the data thereafter was very quick and we were able to FTP all the data to the client with no data loss whatsoever.   
 
 
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"Thank you so much for all your help - Data Recovery Specialists are a real life saver!  I do not know what I would have done without the data you recovered.  We would have probably had to re-record all the location shots, which would have been time consuming and very expensive"  BBC Wales

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"Thank you for solving our stiction issues so promptly from our reel to reel tapes.  We were expecting to lose some of the data, so we were extremely happy when you recovered the full survey.  The data has proved invaluable"  Regal Petroleum
 
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"Thank you for processing the 3590 tapes from our marine survey and copying to HDD.  Your unique NavMerge service combining the navigation information with our 3D seismic data saved us a huge amount of time"  Portugese Ministry of Defence
 
See what our clients say!

 

"I thought we would never get our CT scans converted into DICOM and imported onto PACS, but you came to our rescue" NHS