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RAID Recovery
We restore your data professionally and are very experienced with defective RAID systems!

RAID Recovery

RAID data recovery requires expert knowledge. In addition to defective hard drives, damaged RAID controllers, firmware bugs, damages/corrupted file system and human errors (e.g. shares accidentally deleted, incorrect RAID level set up etc.) are among the most common causes for data loss in RAID arrays.

24h-Service 98% rescue success

In-depth topics on RAID data recovery

Comprehensive technical RAID data recovery know-how

Attingo specializes in data recovery and data recovery from failed RAID arrays. Continuous research and development as well as more than 25 years of experience make Attingo Data Rescue a leading provider of RAID data recovery in Europe. Fast and reliable RAID data recovery can only be guaranteed with in-depth knowledge of internal system structures (e.g. firmware), algorithms (e.g. parity history) and the behavior of RAID controllers. For example, the course of the parity, the offset and the size of the individual strips vary from model to model.

Among others, RAID controllers were reverse engineered by the following manufacturers: Adaptec Controller, 3Ware, ICP Vortex, Intel, Areca, ATTO, Dawicontrol, HighPoint, LSI, QLogic. The data recovery of failed RAID systems takes place exclusively in our in-house laboratories. Attingo has ISO 5 class clean room laboratories according to ISO 14644-1 in Vienna, Hamburg and Amsterdam.

In more than 98 % of all cases, Attingo can save the data from failed servers, RAID and NAS storage systems and restore them successfully.

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staatliche Auszeichnung Austria A iso 9001 siegel grau https://www.allianz-fuer-cybersicherheit.de

Professional RAID data recovery - we help with data loss

  • Depending on the urgency of the RAID data recovery, we offer you special diagnostic procedures
  • Fixed price offer after the diagnosis
  • No hidden costs - data recovery costs only in case of success!
  • The data recovery of your RAID array is only carried out by experienced and trained employees
  • Fast response times - 24/7 emergency RAID data recovery for urgent processing
  • In-house recovery tools and individual readout tools for data recovery
  • An extensive spare parts warehouse of over 14.500 hard drives
Contact us - book your RAID data recovery diagnosis today!

Error descriptions from customers who have commissioned us to restore data

  • „A second hard drive failed during the rebuild process“
  • „One hard drive failed a long time ago, now the second hard drive“
  • „The RAID volume is no longer displayed“
  • „Many files are defective after forcing the RAID online;
  • „The server reports RAID offline“
  • „After replacing the defective RAID controller, no RAID volume can be found“
  • „Instead of mirroring, a RAID 0 was set up“
  • „Several indicator lights on the server are flashing“
  • „The server no longer starts up“
  • „The manufacturer's service technician has already tried everything ... without success“

Causes of data loss that require RAID data recovery

There are several causes for data loss in RAID systems. When recovering and restoring data from a storage RAID array, one has to differentiate between physical and logical damage. It often happens that physical defects on one or more hard disks also result in logical damage.

Physical causes of RAID data loss

  • RAID is offline, rebuild abort after another hard drive failed
  • RAID failure after a reboot / restart
  • Hard disk failure due to overheating of the RAID array
  • Voltage peaks, power failure
  • Defective RAID controller in the server (e.g.: firmware error of the controller)
  • RAID or NAS failure after firmware update

Logical causes for RAID data loss

  • Fatal rebuild of the RAID system, wrong hard disk was exchanged
  • After running chkdsk, fsck, the data can no longer be accessed
  • The host file system is damaged
  • Files, directories or shared folders have been deleted from the RAID array
  • The expansion or resize of the RAID with additional hard drives has failed
  • RAID configuration is lost

RAID offline - what to do in case of RAID failure?

  • Error messages such as RAID offline, RAID critical, RAID SUB-OPTIMAL, Drive missing, Disk failed often appear. If the RAID array fails, do not re-power your system prevent automatic file system checks or incorrect rebuilds.
  • Avoid file system checks (chdsk, fsck) or similar programs. This can lead to significant logical damage when the storage is restarted, which minimizes the chances for a successful recovery of the data.
  • Avoid forcing the RAID online. A fatal build can result in corrupt data. Mark the individual data carriers with the respective position (slot). In order to avoid confusion, the defective hard disk/s should be marked separately.

Summary: Data recovery from RAID arrays

General information about RAID arrays

RAID arrays are used for saving data redundantly. In the past this technology was mainly used in companies with server and enterprise storage systems, but nowadays it's also common in the consumer area as NAS systems with more than one hard drive. Dependent on the RAID level, one or more hard drive(s) can fall out without affecting the integrity of the data (excluding RAID0). The most common RAID levels are RAID0 (striping) , RAID1 (data mirroring), RAID5 (redundancy with one parity) and RAID6 (redundancy with double parity) as well as combinations of individual RAID levels (e.g. RAID10, RAID50, RAID51).

Regarding the structure there are differences between hardware and software RAIDs. A hardware RAID is administered via a hardware controller (e.g. Adaptec, 3Ware, LSI, Promise) while a software RAID is administered via a certain software.

The data media used are mostly SAS or SATA hard drives. In the past hard drives with SCSI or SCA interfaces were more common. A main reason why RAID recovery is often needed is that users confuse data availabilty with data security.

Experience with Attingo RAID Recovery
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2021-04-06: , 2x Western Digital Red NASware WD20EFAX-68FB5N0 aus My Cloud EX2 Ultra WDBVBZ0040JCH-20 | Linux

DANKE an das ganze Team
2020-07-14: , WD4001FFSX-68JNUNO WD30EFRX-68AX9N0 aus Netgear ReadyNAS RN10400-100EUS | Linux | BTRFS

immer am laufenden gehalten über den aktuellen Fortschritt bzw. wenn es neue Erkenntnisse gab

Perfekte und rasche Abwicklung
2020-03-30: , 8x 300GB SAS Festplatten ST9300653SS P/N: 9SW066-150 aus Server | NTFS

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Attingo Team
DI (FH) Markus Häfele
General Manager
Peter Franck
Robbert Brans
Ing. Özgür Göksu
Maximilian Maurer
Spare Part Manager
Dipl. Ing. Nicolas Ehrschwendner
Partner and consultant
Sebastian Evers
Customer support
Boris Hakaso
Paul Carlson
success rate
25 years
of experience
rescue success