Why is my harddisk asking to format?

[Windows Central Question]

why harddisk asking format

my segate 1 tb backup plus asking format when connect any laptop. i want to open harddisk with out format, how i can, pls give me step by step process

 

[AV2RY]

1. Open start and search for CMD.EXE
2. Open it and type this command
chkdsk /X /F:

(F is your Seagate disk letter in My Computer. Dont forget spaces before "/")

3. Hit enter and wait until it finishes. It should open now