Extreme PRO V90 Card error

Memory Cards SD | microSD | CFast | CFexpress | CompactFlash
1

Purchased the G9ii recently along with 2 SanDisk Extreme Pro V90 cards. Everything was purchased from B&H Photo. Both cards were formatted in camera before using.

Last few days have been using the G9ii for video and while recording yesterday in 4k 60p 4:2:0 I got a card write error. Afterwards the camera would no longer recognize the card, the screen would just read “Insert memory card again”. I could not get the card to be recognized in my MacBook, and the provided RescuePro Deluxe software could not see the card either. It’s as if the card is completely dead. I thought maybe it was just a bad card and planned to file a warranty claim with WD.

Today while filming with the second SanDisk Pro V90 card got the same card write error message, followed by a dead SD card that neither the camera or the iMac at my work will read. I have never had an SD card completely killed in this way.

2 cards dead in 2 days, can it be bad SanDisk cards or is the G9ii killing them? Going to do a factory reset on the camera as well as install the update from December. Will need to purchase a different brand V90 card, possibly Prograde, to see if the issue happens again. If it does it is likely the G9ii…

Has anyone else run into this issue with the G9ii ?

My Extreme Pro V90
My Extreme Pro V90560×420 92.1 KB

Error 1
Error 1420×560 46.1 KB

Error 2
Error 2560×420 38.6 KB

2

Two dead cards in quick succession suggest this could be the case. SanDisk cards are generally reliable, but even reputable brands can have defective products. Try some manual fixes from this article.

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I agree, It HAS to be the cards. Here is my story. Happened to me AGAIN, just 2 hours ago!!!

HELP: Repeated SanDisk V90 Card Failure on Lumix S5 II (Need Real Feedback – Not Basic Troubleshooting)

Hey everyone,
I’m reaching out for some real support and insight. I’ve now had two SanDisk Extreme Pro 128GB V90 SD cards fail on me during a shoot — nine months apart — both under similar circumstances. These are not cheap cards, and the loss of footage is beyond frustrating.

Here’s my detailed breakdown:

Camera & Setup Info

  • Camera: Panasonic Lumix S5 II

  • Firmware: Latest version (fully up to date)

  • Cards: SanDisk Extreme Pro 128GB V90 UHS-II

  • Total Cards Owned: ~15 (all high-end SanDisk V90s)

The Problem (Occurred Twice, 9 Months Apart)

  • Issue: Card corrupts during a shoot.

  • Error Message: “Please insert SD card” appears mid-shoot.

  • Result: Card is not recognized by camera or computer. Recovery software fails to even read it.

Common Denominators in Both Card Failures
  1. Old Footage on Card:
  • I did not format the card before the shoot because it had footage from earlier that day or a previous session.
  1. Frequent Playback During Shoot:

  • I was reviewing and playing back clips often during the shoot.

  • Then switching back and forth between playback and shooting mode — probably 20+ times that day.

  1. Failure Occurred During Transition:
  • Card failed right as I transitioned from playback mode back to shooting mode.
Recovery Attempts (Both Times)

  • Tried 3 different computers and 2 other cameras.

  • Tried multiple recovery software programs.

  • In both cases: Card not even recognized = cannot recover data.

  • Important distinction: If the card had simply been corrupted, I could have used recovery software to retrieve the footage. But because it was a complete card failure, the card couldn’t be read at all — making recovery impossible.

  • The only theory I can come up with is that there may have been some sort of electrical short or glitch when the camera transitions from playback to shooting mode — it’s the only moment that lines up in both cases, and the only thing that remotely makes sense at this point.

  • Conclusion: Not a corruption issue — total card failure.

My Usual Workflow (for the past 9 months):

  • I always use a freshly formatted card before every shoot.

  • I follow best practices with formatting in-camera before use.

  • These two failures are the only exceptions (where I didn’t freshly format before shooting).

My Questions for the Group:

  • Is this a camera issue (Lumix S5 II)?

  • Is it a card brand issue (SanDisk V90)?

  • Or do I absolutely have to freshly format every card before every use, even if the card already has footage from the same camera/session?

  • Has anyone else had issues switching between playback and shooting modes and encountering this kind of error?

Final Notes:

  • All footage was recorded on the same camera and left in the same card. No cross-camera or card swaps.

  • I’ve contacted both SanDisk and Panasonic — both gave me basic troubleshooting and provided no help.

  • I’m looking for real feedback or insights to avoid this happening again.

Any help is appreciated. Thank you!