Lexar PRO Blue Series SDXC Memory Card - 64GB

"800x" is a performance rating that historically correlated to a specific read speed. For this card, it signifies a maximum read speed of up to 150MB/s.

Yes, with its V30 rating, it guarantees a minimum write speed of 30MB/s, which is generally sufficient for most 4K video recording scenarios.

No, SDXC cards are not backward compatible with SDHC-only slots. Your device must explicitly support the SDXC format.

The card can operate reliably between 0°C and 70°C. It can be stored between -25°C and 85°C.

Avoid touching the gold contacts, store it within the specified temperature range, protect it from physical damage, and always back up your data regularly. Eject the card safely before removing it.

UHS-I U3 indicates that the card supports the UHS-I interface and guarantees a minimum sustained write speed of 30MB/s, which is beneficial for high-resolution video recording.

Ensure the card is properly inserted. Try cleaning the contacts. Check if the device supports SDXC cards. Format the card in the device if possible (this will erase all data).

Verify the card reader and device support UHS-I speeds. Ensure the card is not full. Test the card in a different compatible device or card reader.

Stop using the card immediately. Back up any recoverable data. Format the card using a reliable formatting tool or within your camera/device.

Check the write-protect switch on the side of the SD adapter if using one. If the card itself is not write-protected, the issue may be with the device or file system.