Your Sony camera may not save MP4 video clip if power cuts out while recording. This case explains how to recover lost camera footage interrupted mid-recording.
The inquiry arrived by email, with the kind of candor that makes diagnosis easier:
“My Sony X30’s battery suddenly cut out during recording, so the file was never written properly. I didn’t notice at the time, and went on to record a few more short clips afterwards. Is there any chance the video file can be saved? The memory card is a SanDisk V30 256 GB.”
Everything a recovery assessment needs was in those three sentences: the failure (sudden power loss mid-recording), the aggravating factor (more clips recorded afterwards), and the medium (a 256 GB SanDisk V30). The question — is there any chance? — deserved a precise answer rather than a hopeful one.
The problem — the classic stack, with one worry attached
A sudden battery cut mid-recording is the textbook Sony failure: the recording never finalizes, and what the camera leaves behind is either a broken file entry or nothing visible at all. The footage itself is written to the card as it records — only the packaging is missing. That part alone is very recoverable.
The worry was the second sentence: several short clips recorded afterwards. New recordings claim “free” space on the card — and the space freed by the interrupted recording’s missing entry is exactly where its data lives. A few short clips meant light, localized overwrite — but whether the main recording survived it, and how much of it, could only be determined by looking at the actual data. Hope wasn’t the right tool; the card was.
What we did — image first, answer with certainty
Our reply gave the client a simple, safe path:
- Step 1 — Image the card. Following our step-by-step instructions, the client created a complete image of the SanDisk card on his own computer and shared it with us. The physical card never left his hands; nothing we did could disturb it.
- Step 2 — Inspection and a definite answer. We downloaded the image and examined it: mapping the interrupted recording’s data across the card, and overlaying the damage map of the later short clips. The verdict came back concrete: 20 GB — about 20 minutes of video — was intact and recoverable, with only the portions the short clips had claimed lost for good.
- Step 3 — Reassembly and delivery. The surviving data was extracted and rebuilt into a complete, playable video, verified end to end.
✓ Result
Confirmed recoverable: 20 GB, roughly 20 minutes of footage. Fully recovered and delivered within 1 day of receiving the image. The client knew the exact scope before paying a cent — no hoping, no gambling, just a measured answer from the card itself.
Why we answer with numbers, not reassurance
“Is there any chance?” is the question every recovery inquiry starts with, and the honest answer is always the same shape: the chance is measurable, and the measurement is free. A card image tells us exactly what survived, exactly what was overwritten, and exactly what a recovery will deliver — before any commitment. In this case, a worry (“I kept recording!”) turned out to cost only minutes of footage, not the session. In other cases the same measurement honestly reveals the opposite. Either way, the client decides with facts.
Takeaways
- Sudden power cut mid-recording = unfinalized but written footage; the base case is recoverable.
- Recording more clips afterwards risks overwrite — but “risk” is not “loss”: light recording may cost little, and only the card can say.
- Card imaging + sharing keeps it fully remote and completely safe — your card never leaves home.
- Ask for the numbers: GB recoverable, minutes of footage, which parts are gone. A professional answer is measurable.
- SanDisk V30, 256 GB or 32 GB — the card matters less than what’s on it.
- If you have RSV file in the card, it will more be more easier, just send us your RSV file, we provide Video Repair Service.