Hi khiremandar,
Dear member of SanDisk Community, welcome.
Friend, please:
1-Â Test your MicroSD 64GB c10, in other laptops, directly to its port-card (not USB card-reader).
    Also, see what capacity and format, shows.
2- Â Use only , USB card-reader of brand, of high quality (SanDisk, Kingston, Lexar, Samsung, etc).
     Because most and cheap (as those you used) are junk, not have the chip, check it yourself.
3-Â Â Try formatting with the tool (portable app, free): USB Flash SD Formatter 4.00, Portable app, free.
    Then remove and re-plug the card.
 Luck.
Regards, Alfred. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (Google translated)