I am trying to clone a 64GB SD card, but I noticed that the card shows 30MB less space than expected. This discrepancy is preventing me from successfully cloning the SD card using various tools and methods.

System Details:

Source SD Card: 64GB SanDisk Ultra
Target SD Card: 64GB SanDisk Ultra
Operating System: Raspberry Pi OS
Steps Taken:

Checked the available space on both SD cards using df -h and lsblk.
Attempted to use disk cloning software as mentioned above.
Tried various partitioning and formatting tools to align the space properly.
Questions:

Why does my 64GB SD card show 30MB less space than expected?
What steps can I take to ensure a successful clone of my SD card?
Are there any specific tools or methods recommended for cloning SD cards with minor space discrepancies?
I appreciate any guidance or tips from the community to resolve this issue. Thanks in advance!

Here’s what I’ve tried so far:

Win32 Disk Imager – The process fails due to insufficient space.
Etcher – I encountered errors related to mismatched sizes.
dd on Linux – The cloning process completes, but the cloned card doesn’t work correctly.
GParted – I attempted to resize the partitions, but it didn’t resolve the issue.