Why is my attached drive showing an sda partition?

[curlyimac]

I have attached a 3TB seagate to my ac68u router. I used to have it working before with both the pc and macs in the house could read and write to it. but can't remember what it was formatted.
Now I formatted in OS journaled and I see an sda partition. That never used to be there before.
what is the SDA and is it an issue?

 

[ColinTaylor]

sda is the name given to the first disk when it doesn't have a volume label. The second disk would be sdb, etc.

If you give your disk a volume label it will appear as that name instead.

P.S. I assume by "OS journaled" you're referring to MacOS' HFS+. I'd suggest that you use another format that isn't dependent on a proprietary driver, like ext4.

 

[curlyimac]

I am going to try NTFS. I didn't think the mac could write to it but I read it can over a network. Thinking maybe that's what I used before.