A recovery lab does not “fix” a drive. It builds a readable copy of your data and hands that back, working on the copy rather than the failing hardware.
Step one is imaging, not recovery
The first job is a sector-by-sector image onto separate healthy storage, taken through a hardware write-blocker so a read can never become a write.
A drive with marginal heads reads most of the surface on a good pass and fails on the next, so an image lets the lab slow down for an erroring sector, skip it, and return to it hours later. Ask for the defect log, the list of unreadable sectors, because it is the only honest explanation for gaps in the folder you get back.
Software-only recovery: when it is enough
If the disk reads cleanly and the problem is logical, no hardware work is needed. The file system metadata is damaged, deleted, or pointing at the wrong place, and a tool reconstructs it. That covers deleted files, a partition lost to a format, a corrupted table after a power cut, and a system that will not boot but whose user profile is intact.
Tools rebuild the structures and mount the volume read-only, or carve files out by signature, which is how you get F0001234.docx instead of real names. This is the cheapest and fastest category, normally one to two days.
When the platters come out
A drive is opened only when imaging halts with an I/O error at a specific location, or when it clicks, grinds, or is not detected. The cause is usually a weak or shifted head assembly, sometimes a dead motor or a burned controller board. On the bench the head stack is swapped for a donor of a matching model, or a single damaged head is swapped so the rest of the surface can be read with that head parked clear of the damaged zone.
Read heads fly a few micrometres above the platter, so a 2-micron dust particle gets ploughed in and cuts a trench that permanently destroys a band of data. Be realistic about India: a true ISO Class 5 cleanroom costs more than many recovery businesses turn over in a year, and most do not own one. Ask where the head work happens, in your facility or at a partner.
SSDs are a different problem
NAND flash is a matrix, not platters and heads, so none of the mechanical playbook applies. Failures are controller death, firmware translation-table corruption, or worn-out flash. Without the controller you cannot read the mapping that turns physical blocks back into files, so the options are transplanting the flash onto a compatible donor board, or reading the raw chips and rebuilding the mapping by hand. The second is specialist, expensive, and fails on encrypted or heavily wear-levelled drives.
Two hard limits apply: if the drive was powered on after failing, garbage collection may already have destroyed what you wanted, and an encrypted volume without the key is unreadable even from perfect flash.
What a realistic success rate looks like
- Deleted or formatted, disk healthy: usually complete.
- Single-platter head crash, surface undamaged: usually most of the drive.
- Head crush with debris, or a scratched head path: partial. Data often returns but the directory structure is gone, so files arrive with generated names.
- Multi-platter contamination, fire, or water on a spinning drive: fragments, or nothing worth attempting.
Anyone quoting 100% before a bench diagnosis is selling. A written probability for your specific drive, after diagnosis, is the most you should expect.
How to evaluate a lab, and what it costs
Check for hardware write-blockers, imaging before any repair attempt, a written diagnosis naming the failure mode, and whether the work is in-house. Ask how your data is destroyed after delivery, because your accounting files will be on their disk.
| Job | Typical range |
|---|---|
| Software-only logical recovery | ₹2,000 - 8,000 |
| Single drive, physical, head or board work | ₹8,000 - 25,000 |
| Multi-platter or outsourced cleanroom work | ₹15,000 - 40,000 |
| RAID or NAS reconstruction | ₹12,000 - 60,000 |
| Bench diagnosis | ₹500 - 1,500, often credited |
Ranges vary by brand and model, whether a donor part exists, and whether the lab owns the capability or resells it. A quote far below the others is usually a logical-recovery quote for a physical problem.
FAQ
How long does recovery take? Logical cases finish in one to two days. Physical cases run three to ten working days, and anything sent to an external cleanroom partner can take two to four weeks.
What happens to my data at the lab? Ask for an NDA, whether the work machine is on the internet, and how the image is erased after delivery. A reputable lab answers all three unprompted.
Do I bring the drive or the whole machine? Just the drive if it is removable, plus the machine model. Bring the whole machine only for soldered storage.
Is there a chance of a wrong or partial file? Yes, likelier on physical failures. Image the recovered data onto a clean disk and open several large files before deleting anything.
Why is one quote so much lower than another? Usually scope, not value. Ask whether the low quote excludes opening the drive, excludes donor parts, or hides a contingency charged later.
Get a diagnosis before a quote
24Bit System runs data recovery from Noida for hard drives, SSDs, USB devices and RAID arrays. If you are still deciding what to do in the next hour, read the first-hour guide. For arrays and NAS units we also handle server and storage setup. Call +91 7840002466 or contact us.
