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Does heads count different make drives difference?

Hi there,

I am using two Seagate drives ST31500341AS to create RAID 1 system in a NAS system.

However NAS reported that two drives are not identical. From the fdisk -l I got following info. - heads count and sector count are different.

Disk /dev/sdb: 1500.3 GB, 1500301910016 bytes
255 heads, 63 sectors/track, 182401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/sda: 1500.3 GB, 1500301910016 bytes
256 heads, 63 sectors/track, 181688 cylinders
Units = cylinders of 16128 * 512 = 8257536 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

My question is why does the drives with same model and same firmware come with different specs, and are they really different?

Is there anything I can do to make them identical?

ASKER CERTIFIED SOLUTION

Norm Dickinson

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SOLUTION

David

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tomcattyy

ASKER

I end up place both disks into a PC and format as NTFS to eliminate the original partition and get the RAID 1 system get going.

Thanks for all the info.

Norm Dickinson

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