My book live can't access drive

My book live 2tb started to click the other day

I ve tried a number of fixes i found on here and am part way through one using a systemrescue cd and gparted. this is what i get after the first step

[root@sysresccd ~]# mkdir /mnt/usb
mkdir: cannot create directory ‘/mnt/usb’: File exists

I then tried to see if i could see the drives and this followed:

[root@sysresccd ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 638.4M 1 loop /run/archiso/sfs/airootfs
sda 8:0 0 1.8T 0 disk
├─sda1 8:1 0 1.9G 0 part
├─sda2 8:2 0 1.9G 0 part
├─sda3 8:3 0 489M 0 part
└─sda4 8:4 0 1.8T 0 part
sdb 8:16 1 7.5G 0 disk
└─sdb1 8:17 1 7.5G 0 part
sr0 11:0 1 699M 0 rom /run/archiso/bootmnt
[root@sysresccd ~]# fdisk -l
The backup GPT table is not on the end of the device. This problem will be corrected by write.
Disk /dev/sda: 1.84 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: WDC WD20EARX-00P
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: gpt
Disk identifier: 14E3AE25-6A4D-47BE-B348-8F0F6BA359AD

Device Start End Sectors Size Type
/dev/sda1 1032192 5031935 3999744 1.9G Linux RAID
/dev/sda2 5031936 9031679 3999744 1.9G Linux RAID
/dev/sda3 30720 1032191 1001472 489M Microsoft basic data
/dev/sda4 9031680 3907028991 3897997312 1.8T Microsoft basic data

Partition table entries are not in disk order.

Disk /dev/sdb: 7.51 GiB, 8053091328 bytes, 15728694 sectors
Disk model: ProductCode
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: 0x0019d088

Device Boot Start End Sectors Size Id Type
/dev/sdb1 * 64 15728693 15728630 7.5G b W95 FAT32

Disk /dev/loop0: 638.41 MiB, 669409280 bytes, 1307440 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

Any advice greatly appreciated