SAS 146 instead of hdd 72 in RAID 10

Hi
I have a problem with a RAID set : I used 8x72 G SFF 15K DP with HPDB firmware on HP Dl380 G6 with P410 controller and use RAID 1+0 for this 8 HDDs ; now HDD no7 failed and and replaced with new HDD like other (72G15KDP) with same firmware but didn't fix yet .. I replaced it again and didn't change ...
1- why none of this HDD didnt fixed the HDD failure ?
2-can I use HDD 146 15K for this raid set instead of failed 72 hdd ?
thank you .

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Hello,
I have been looking in to your question and found a few links that may be helpful:
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SAS 146 instead of hdd 72 in RAID 10

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