Urgent · Do NOT force a rebuild
RAID 5 Failed? Degraded Array Recovery
A RAID 5 survives one disk failure — but a second failed disk or a failed rebuild takes it offline. It's highly recoverable by reconstructing the parity — but only if you don't force a rebuild. Power it down and call an engineer.
4.9 / 5915 reviews · Emergency & NDA (opens Google in a new tab)Quick answer
RAID 5 tolerates one failed disk. When a second disk fails, or a rebuild fails or is forced onto a stale disk, the array goes offline — but it's usually recoverable by reconstructing the parity and disk order in our lab. Do NOT force a rebuild, re-add the removed disk, or re-initialise. Power the array down, label the disk order, and call an engineer.
Act now
What to do right now (safe steps)
Step 1: Power the array / server down
Stop it before an automatic rebuild runs onto a degraded disk and overwrites parity.
Step 2: Label each disk with its bay number
Disk order is critical for reconstruction. Note which drive came from which slot before removing anything.
Step 3: Don't force a rebuild or re-add disks
Don't rebuild, re-add the failed disk, initialise, or run repair — these overwrite recoverable data.
Step 4: Call a recovery engineer
Book a priority diagnosis. Call us or start online.
Understand it
RAID 5 states: healthy → degraded → offline
✓ Healthy
All disks online. Data and parity distributed across the array.
Degraded (1 disk down)
Still running on parity — but with no redundancy left. Back up now and replace the disk carefully.
Offline (2 disks down)
The array drops. Highly recoverable in the lab — if not forcibly rebuilt.
Diagnosis
Why RAID 5 arrays fail
Second disk fails during rebuild
Aging drives bought together fail close in time — very common.
Rebuild fails or errors out
A bad-sector member disk stalls the rebuild.
Controller failure
The RAID card dies, orphaning the configuration.
Power loss mid-write
Corrupts parity and array metadata.
Critical
What NOT to do with a failed RAID 5
Force a rebuild
Rebuilding onto a stale/degraded disk overwrites the parity we need. The #1 cause of loss.
Re-add the removed disk
Re-inserting a dropped disk can trigger a destructive rebuild.
Initialise the array
"Initialise" wipes the RAID configuration.
Run CHKDSK / fsck
Repair tools on a broken array can corrupt it further.
Good news
Is a failed RAID 5 recoverable?
Usually yes — even RAID 5 with two failed disks is highly recoverable, provided it hasn't been forcibly rebuilt. We image every member disk (repairing failed drives in the cleanroom), determine the RAID parameters — stripe size, disk order, parity rotation — and virtually reconstruct the array without the original controller, then extract your data. See the full service: RAID data recovery.
Transparent pricing
How much does RAID 5 recovery cost?
Simple arrays can start from around $400; indicatively $1,000–$2,200 (SGD) for logical reconstruction, or $1,800–$3,500 when member disks need cleanroom repair. Emergency service is available. Your free diagnosis confirms the exact fixed price. Full detail on our cost guide.
Getting it to us
How to get your array to us — including after hours
Power the array down first. Do not rebuild, reinitialise or re-order the disks — and label them in bay order before you remove anything.
- Walk in — 6 Harper Road, Leong Huat Building #05-02, beside Tai Seng MRT. Monday to Friday, 9.30am–6.30pm.
- After-hours drop-off locker — available 24/7 and monitored by CCTV. WhatsApp us on +65 8127 7508 before you come over and we'll walk you through it.
- Bringing a populated NAS or server? Message us first and we'll advise on safe transport and what to label before you unrack anything.
How long it takes: diagnosis is typically same-day to 24 hours. Standard recoveries often complete within 3–7 business days depending on complexity; emergency and priority service is available for urgent business cases.
Free diagnosis whichever route you choose, and a fixed written quote before any work begins. If you decide not to go ahead, you collect your device and owe nothing.
Answers
RAID 5 failure FAQ
Usually yes — including RAID 5 with two failed disks — provided you haven't forced a rebuild. We reconstruct the parity and disk order from imaged members. A free diagnosis confirms it.
Not necessarily. Two failed disks take the array offline but it's often recoverable in the lab. Power it down and don't rebuild.
No. Forcing a rebuild or re-adding a dropped disk can trigger a destructive rebuild that overwrites recoverable data. Stop and call us.
Power the array down and don't retry. We recover from the imaged member disks. A failed rebuild is a common, recoverable scenario.
No. We determine the stripe size, disk order and parity rotation from the drive images themselves, so the array is reconstructed virtually. That is also safer than a controller-led rebuild, which can overwrite parity and make the situation worse.
Simple cases can start from around $400; typically $1,000–$2,200 (logical) or $1,800–$3,500 with failed disks. Your free diagnosis gives an exact fixed quote, with emergency service available.
Zero risk
Free diagnosis & a fixed written quote
What our clients say
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RAID 5 Data Recovery – Rated by customers on Google
915Google reviews
4.9 out of 5
Updated 5 Nov 2026
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