Getting a message that external needs formate

[alinawaiseh]

I have a similar condition with My Ext Hd Iomega.
I was trying to backup my Disktom where it jamed and I turned the powed of , when I pluged my Hd in any computer sice then it keeps asking me to format my Hd. how can i get back my data

 

[nhasian]

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