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Matthew_Wai@My-PC:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk
├─sda1 8:1 0 100M 0 part /boot/efi
├─sda2 8:2 0 16M 0 part
├─sda3 8:3 0 70.4G 0 part /media/Matthew_Wai/Windows 10
├─sda4 8:4 0 499M 0 part
├─sda5 8:5 0 300M 0 part
├─sda6 8:6 0 4G 0 part [SWAP]
├─sda7 8:7 0 75.7G 0 part /
└─sda8 8:8 0 314.8G 0 part
"sda1" was created automatically by "Windows Setup".
"sda5" was created manually by me just before I installed Linux.
Both are EFI partitions. Only "sda1" is present in "/etc/fstab" as shown below:
Matthew_Wai@My-PC:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk
├─sda1 8:1 0 100M 0 part /boot/efi
├─sda2 8:2 0 16M 0 part
├─sda3 8:3 0 70.4G 0 part /media/Matthew_Wai/Windows 10
├─sda4 8:4 0 499M 0 part
├─sda5 8:5 0 300M 0 part /media/Matthew_Wai/C80E-202D
├─sda6 8:6 0 4G 0 part [SWAP]
├─sda7 8:7 0 75.7G 0 part /
└─sda8 8:8 0 314.8G 0 part /media/Matthew_Wai/HDD
The mount point is "/media/Matthew_Wai/C80E-202D" as shown above.
Code:
Matthew_Wai@My-PC:~$ ls /media/Matthew_Wai/C80E-202D
Matthew_Wai@My-PC:~$ sudo ls /media/Matthew_Wai/C80E-202D
[sudo] password for Matthew_Wai:
Verification successful
Matthew_Wai@My-PC:~$
According to the UEFI specification (see section 5.3). the primary partition table is stored at the start of the disk and the backup partition table is stored at the end of the disk. The space in between is the usable space. Your sda5 partition will not have been used during Linux installation (only the primary partition table and backup partition table will have changed). As your sda5 shows as empty it can be safely removed.
Am I right in thinking that "sda5" is redundant? If so, may I simply delete it?
To confirm it's both unneeded and perfectly safe to remove, examine /boot/efi/EFI/. You should find directories there for Linux, for Windows, and likely one named BOOT. Each should contain at least one file used for booting.
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