Chromebook dd command error, no space left on a drive that has enough space

I’m trying to put Ventoy on a 128 GB flash drive, but when I tried to use the dd command, but when i tried i got this error

wolfy@penguin:~$ sudo dd if=ventoyiso.iso of=/dev/sda bs=4M status=progress
dd: error writing '/dev/sda': No space left on device
1+0 records in
0+0 records out
503808 bytes (504 kB, 492 KiB) copied, 0.0258977 s, 19.5 MB/s

I’m really new to this so i don’t know why this is happening