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Index: hdparm-9.43/geom.c
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===================================================================
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--- hdparm-9.43.orig/geom.c
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+++ hdparm-9.43/geom.c
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@@ -201,7 +201,7 @@ int get_dev_geometry (int fd, __u32 *cyl
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 			__u64 hs  = (*heads) * (*sects);
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 			__u64 cyl = (*cyls);
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 			__u64 chs = cyl * hs;
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-			if (chs < (*nsectors))
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+			if (chs < (*nsectors) && hs)
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 				*cyls = (*nsectors) / hs;
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 		}
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 	}