Can i do a disk repair in my external hd which has my time machine?

my imac is crashing ,i have done a clean install of snow leopard & still it has crashed ,i did a disk repair of my hd & it was all good now can i do a disk repair on my external hd on which i have my time machine & music stored without erasing anything?
thanks

Yes, you can do the "repair disk" function of disk utility on the external drive and maintain it's data.
Regards,
Captfred

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