hi
i have linux mint 19.3
in booting i have this massage"
error :failure reading sector 0x830 from 'hd0'
Entering rescure mode...
grub rescure>"

in live mint cd
see
int@mint:~$ sudo su
root@mint:/home/mint# fdisk -l
Disk /dev/loop0: 1.8 GiB, 1948299264 bytes, 3805272 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xbca46687

Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 110593844 110591797 52.8G 83 Linux
/dev/sda3 110596094 976771071 866174978 413G 5 Extended
/dev/sda5 110596096 417796095 307200000 146.5G 7 HPFS/NTFS/exFAT
/dev/sda6 417798144 724998143 307200000 146.5G 7 HPFS/NTFS/exFAT
/dev/sda7 725000192 976771071 251770880 120.1G 7 HPFS/NTFS/exFAT

Partition 3 does not start on physical sector boundary.




Disk /dev/sdb: 3.8 GiB, 4022337536 bytes, 7856128 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x1dda4ac4

Device Boot Start End Sectors Size Id Type
/dev/sdb1 * 0 3978175 3978176 1.9G 0 Empty
/dev/sdb2 680 5607 4928 2.4M ef EFI (FAT-12/16/32)
root@mint:/home/mint# sudo mkdir /mnt/temp
root@mint:/home/mint# sudo mount /dev/sda1 /mnt/temp
mount: /mnt/temp: wrong fs type, bad option, bad superblock on /dev/sda1, missing codepage or helper program, or other error.

help me .

This is not a problem (at this moment). You can fix it later if you wish, but not related at all.
looks like /dev/sda1 is not a valid filesystem, cannot be booted.

As had already been mentioned there appears to be something wrong with the filesystem on sda1. Was this a working system? Explain in detail what you was doing when this happened. Maybe run fsck on the partition will fix.