microSD XC painfully slow write-speed

Well the card is obviously fine physically, is there an option to turn on indexing on this card ?
 
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I have no idea how to do that. :/ By the way the speed of files-transfer (my files) is back to 5 MB/s, ever since I did the test on Crystall... (but I don't know it's gonna be permanent)

Is 5 MB/s an appropriate transfer speed for a Class 1 UHF microSD XC card?
 
If you go to your drives section, locate the msd card and right click, select properties and in the general tab, it may have an option to index the contents of this drive, it is really for faster file searches but may help speed slightly.

The speed does seem a bit slow, I still believe it maybe the card readers that are holding it back, most card readers are basic and slow, perhaps to get faster speeds you may need to invest in a high speed usb 3.0 card reader like these - http://www.bhphotovideo.com/c/buy/Card-Readers/ci/1096/N/4037060555
 
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Now there seems to be an even bigger problem:

Yesterday while copying some files to test the effective speed, the entire computer freezed, so I had to force-shut down the laptop by holding the power button for 5 seconds. When I tried to plug it in back after restarting it a message comes up telling me that I have to format the disk to use it.

But when I try to format it, it simply tells me that It's impossible to format.
(And curiously it lists the size of the msd as 1,96 TB[??])


SDFormatter says this:

"The Memory Card is write-protected. Please release the write protect switch."


Guiformat says this:

"Failed to set volume label
GetLastError()=1005
The volume doesn't contain a recognized file system.
Check that all required drivers for the file system are loaded and the volume isn't damaged."

What can I do?
 
If you mean in the Computer screen, next to C:\, D:\ yes, but if I try to open it, it tells me that the drive needs to be formatted; when I try to, it tells me "Impossible to complete the formatting." (my OS is in Italian so I'm translating from italian to english)
 
yes I'm in it now

http://postimg.org/image/gepwh9qcz/

gepwh9qcz
 
Yes, it's P:\...

No, it still tells me it's impossible. Now I'm trying to Slow Format (unticking Quick Format).
 
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You could do, but when did you last run virus or malware scans ?

Judging by how problematic this card is, I think it may either be a defective card or your system could have some type of infection.

Also try formatting the card within one of your devices i.e camera, phone etc
 
I don't think it's an infection, since all other sd cards and hard-disks work fine. Maybe it's a defective card... My other devices won't detect the card, so I can't try that. I tried the slow format, but it interrupts after a while. What else can I try?

EDIT HDTune Error Scan still shows like before (all green, undamaged). But the speed test is 2,7 MB/s
 
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Definitely seems like this card is defective which would explain the original drop in speed as it broke down and has now reached the point of unusable.

You could try running windows check disk, right click disc 1, select properties then tools and run error check.
 
I tried to, but it tells me that in order to run checkdisk I need to format the drive, so... nothing again.

Isn't there some drastic way to restore the card to factory condition? Since it's seem to be OK on a physical level.

EDIT Right now I'm trying the "Wipe Data" option of EASUS Partition Manager...
 
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