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Formatted sd card.

C

cantbeatdroid

Newbie
Hi all

I have a strange problem with my SanDisk 128GB card. I formatted it to NTFS and now it wont mount up in my tablet. I used the Command Prompt to format the drive. I got this message "Data error (cyclic redundancy check). Is this the reason why it wont mount up. My tablet supports NTFS access. A 64GB NTFS card mounts up OK. A 128GB FAT32 card mounts up OK. Any help would be appreciated.
 
How did you format it? Have you tried formatting it with different software or hardware? Does it work in a different device?
 
Crashdamage said:
How did you format it? Have you tried formatting it with different software or hardware? Does it work in a different device?
Click to expand...
Hi there

I used cmd "convert (drive letter):/fs:ntfs". That's when "Data error (cyclic redundancy check)" message came up. I tried the conventional way e.g. right click drive>format> NTFS but I got the message "Windows was unable to complete the format". I don't know of any other hard/software that can format to NTFS. The 128GB card mounts up fine with FAT32 in all my devices. My Teclast P98 Air will support access to NTFS. That's why I want to format the card to NTFS so I can transfer large film files. A 64GB NTFS card mounts up fine. I know the cmd operation converts the drive. Is that different to converting the card?
 
The command "cmd convert (drive letter):/fs:ntfs" attempts to convert the file system to NTFS rather than do an actual format. IIRC, it's not reliable and could be why it spit out the data error. The usual 'right click/format then failed because that only attempts what's commonly called a 'quick' or 'fast' format, which is dependent on the existing filesystem being in a usable state or the disk or, in this case, SDcard being unformatted. But the filesystem was already trashed by the conversion attempt.

You need to try a full format, sometimes called a 'deep' or 'slow' format. This will create the filesystem totally from scratch. It can be done from a Windows PC without additional software. Sorry, but I can't remember the manual command, I've been away from Windows too long. The exact mouse steps vary by Windows version and you didn't specify yours. Likely I wouldn't remember that method anymore anyway. Windows Help will tell you how to do it.

Of course, if all fails the card is probably just bad, fairly common with SD cards.
 
Well the previous post was 18 months old, so he'd probably sorted it by now ;)

And when I see "fake card" I don't assume "China", I think "eBay": there's a long-standing scam of taking cheap, low-capacity cards, physically disguising them as higher capacity, doing a small hack so they report a larger capacity than they have then selling them on eBay. It's not the usual "clone phone" type of fake but simple criminal fraud.
 
Regardless of where it came from, since this got bumped it's a good opportunity for yet another reminder about buying SD cards only from reputable sources. The safest is always your local brick-and-mortar store in a sealed package, and stick with the big name brands for the best performance and reliability.
 
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