2011 iMac hardrive failure, options?

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my brother's imac desktop hard drive has failed. cleaned drive after seeing unfixable error. not able reinstall osx due error. thinking buying , installing new ssd. have built own pc , worked apple devices, don't think hardware issue, don't have original osx disk, , there isn't apple store within 3 hours of home. imac automatically partition space osx when detects fresh drive , able download osx via wifi?

info appreciated, thanks!
 

imacs not automatically partition space os x when detect new drive. needs done purchase snow leopard ($20 online apple store), boot sl disc once new drive installed , format new drive mac os extended (journaled) guid partition. install sl on new drive, update sl 10.6.8 combo update , using mac app store download yosemite. if had backup restore up.

luck.
 


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