RAID array Repair and Data Recovery

RAID alarm, array offline, hard drive red light-when the server storage problem, the most valuable is not the hard drive but the data inside. We explain the correct way to deal with RAID failures, to avoid irreparable losses caused by human error.

Common RAID failures golden self-help principle recovery processes real case price reference FAQ

RAID array common types of faults

RAID (disk array) keeps data safe by redundancy of multiple hard drives, but it can fail itself. The most we deal with are these categories:

Single disk dropped/red lightRAID 1/5/6/10 has redundancy, and it usually works if you lose a disk, butAt this point array is in streaking modeAnother bad piece may lose data and must be dealt with as soon as possible.
multi-disk simultaneous offlineRAID 5 allows only one bad disk, two bad crashes. The performance is array lost, the system cannot access. This is the most critical situation.
RAID card failure: array card corruption can cause the hard drive to be unrecognizable, but the data on the hard drive is usually still there and can be recovered by reorganizing the array.
human errorMistaken deletion of arrays, misinitialization, and misbuild to the wrong disk--human errors such as these are the hardest hit areas for data loss.
array degradation does not alarmMany enterprise arrays have already degraded and run unnoticed until the second disk is broken, too late.

The golden self-help principle after array collapse

When something goes wrong with RAID, wrong self-help is more terrible than the failure itself. Please remember these iron rules:

Stop immediately and do not write any more data. Continued use may overwrite recoverable data.
Do not force Online. This is the most common fatal operation-forced online may use the wrong disk synchronization, directly destroying the entire array.
Do not rebuild array, do not initialize. These operations overwrite the data structure on disk.
Note the drawer order of the hard drivesRAID recovery relies heavily on the original disk order, so always label each disk with a location label before removing it.
Record alarm messages and hard drive indicator statusThis information is very valuable for engineers to judge faults.
Contact a professional data recovery team as soon as possible for evaluationRAID recovery is a technical job, the probability of success is very low, the cost of failure is all the data.

Our RAID Data Recovery Process

The core idea behind RAID recovery is:Do not touch the original disk, first mirror, and then reorganize on the mirror. The specific process:

Step 1: Evaluation: Understand the array level, disk number, symptoms, preliminary judgment of recovery possibility and cost.
Step 2: Mirror each disk: Use professional equipment to physically mirror each member disk (including those with bad sectors), and seal the original disk. This step ensures that the data will not be damaged twice due to our operation.
Step 3·Analyze array parameters: Analyze key parameters such as RAID level, stripe size, disk order, and verification direction on the mirror.
Step 4: Virtual reorganization: Virtual reorganization array with analyzed parameters, extract data and verify file integrity one by one.
Step 5: Safe Delivery: Copy data to new hard drive delivery, sign confidentiality agreement, mirror and original disk as per your request.

The whole process is carried out in a cleanroom environment, supporting RAID 0/1/5/6/10 and various NAS storage (Synology, QNAP).

⚠️ The biggest enemy of RAID recovery is tampering.More than half of the failures we inherited were forced online, wrong Rebuild, or random initialization-data that could have been saved was completely destroyed by these operations. Array problems, the first time to stop and contact the professional team, is the safest choice to keep the data.

real case

This is how we help our clients solve problems.

Hospital HIS system RAID5 three disk crash, extreme rescue

In March 2026, the HIS system server RAID5 array of a hospital in Panyu gave an alarm, but the IT personnel did not pay attention to it in time. A week later, the array completely crashed — two of the three disks had bad sectors and one was completely offline. This is an extremely dangerous situation.(Only one bad disk is allowed in RAID5). We first used professional equipment to physically mirror the three disks respectively (bypassing bad sectors), then analyzed the array parameters for virtual reorganization, and finally completely restored all the medical record databases. The whole process worked continuously for 48 hours. Afterwards, we deployed array health monitoring and remote backup for the hospital to avoid repeating the same mistakes.

Dell Server RAID Card Corrupted, Reassemble to Recover All Data

In May 2026, a manufacturing company reported that the file server was suddenly inaccessible. The on-site diagnosis was that the Dell PERC H730 RAID card failed, resulting in the hard drive not being recognized, but the hard drive itself was intact. We connected the hard drive to the universal recovery platform, reorganized the array according to the original RAID 5 parameters, successfully extracted all the production drawings and financial data, and replaced the RAID card to rebuild the array. The downtime of the enterprise was controlled within one day. Client Reviews: Thought a few days all make uncertain, have never thought so fast, data is not less.

price reference

Test first, quote later, repair later

Item	Reference Price	Notes
diagnosis and assessment	RMB 0	Successful recovery only charges, unsuccessful no charge
Logical Tier RAID Defragmentation	From RMB 1500	disk intact/array information missing
Physical cleanroom platter recovery+ reorganization	From RMB 3000	Disk image with bad sectors
NAS Data Recovery	From RMB 1200	Qunhui/QNAP
urgent channel	50% float	Delivery within 48 hours

* The above is the reference price, the specific quote after diagnosis shall prevail; batch/enterprise customers can negotiate discounts. Final pricing is subject to the actual on-site inspection.

FAQ

About RAID array maintenance and data recovery, we are often asked

RAID 5 has a bad disk, can it still be used?

It can be used temporarily, but the array has lost redundancy protection and is in a high-risk state. Please backup your data immediately and replace the failed disk as soon as possible to rebuild it. Do not delay-many total crashes are caused by broken pieces and broken pieces.

Array card is broken, hard drive inserted into other machines can read data?

Cannot read directly. RAID data is distributed on multiple disks according to specific parameters, and needs to be reorganized according to the original array parameters to read. Insert it directly into an ordinary computer or an unmatched array card, and it will not read or destroy the array information.

What is the success rate of data recovery?

Depending on the type of failure and whether it has been mishandled. Simple array information loss/single disk bad sectors, the success rate is very high; multiple disk physical damage or forced online, the success rate will decrease. We will first detect and evaluate, clearly inform the success rate, and then you decide whether to proceed.

Is the recovered data safe? Will it be leaked?

Strict confidentiality. We sign a formal confidentiality agreement, the recovery process can be supervised by customers, data is only used for delivery, and the source data is completely destroyed as required. There has been no record of customer data leakage for 15 years, which is also the reason why hospitals, manufacturing enterprises and so on have trusted us for a long time.