Bought SanDisk Ultra 1TB 5 month ago. Directly for SanDisk. Filled it up. And it started having problems, deleted some files, still got errors, tried to reformat, got errors, files that i deleted are back on the card. Unmounted, removed, reinserted, still errors. Tried entering serial number to check if it under warranty but didn’t fined my serial number. What do i do now. Don’t really mind loosing files. But i don’t want to spend 90.00 for another card.
@NealF
Have you checked our knowledge base articles?
(Get Support for Your SSDs and Flash Products | SanDisk)
Try this one.
Have you opened a Support Case?
If not, contact SanDisk Technical Support for assistance.
(Contact Support | SanDisk)
For the Card authenticity, contact SanDisk support directly and provide proof of purchase (order confirmation, receipt, or invoice).
Next, If you don’t mind losing files, try a low-level format before sending it in: Try diskpart (Windows) or disk utility (Mac) to erase it. And, the behavior you described (deleted files returning, failed formatting) suggests a bad NAND chip or a counterfeit issue (unlikely since you bought it directly).
My suggestion would be, since it has been only 5 months, you should be eligible for a free replacement under warranty. So, Replace it.
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This suggests a problem I have seen with higher capacity storage, problems get worse with higher capacity points
