Rebuilding an array of RAID disks can be time-consuming and also brings more harm to the old disks alongside. Just after a month of the death of the first WD40EZRZ, another disk manufactured on the same date was reported by S.M.A.R.T with C5 and C6 errors and the raw values were "1" in two entries. Luckily, this bad sector is not spreading and the bad count remains the same after a few days. So in about a month, I bought 4 HGST HDDs one by one to replace the old ones.
What a nostalgic brand and product line! Rebranded as a high-end product of Western Digital, the UltraStar is now the only one survived, while the TravelStar and DeskStar were removed years ago. Everything has changed all these years, but never the random reading noise of this brand! This identical noise comes from the old IBM HDD department, the producer of the first hard drive ever. The IBM/Hitachi/HGST is the name for reliability. The oldest working HDD in my hand is an IBM TravelStar DARA2600 6GB IDE 2.5-inch.
The first was a brand new Western Digital UltraStar HC320 HUS728T8TALE6L4. It is perfect but expensive. The later were three used HGST UltraStar HUS724040ALE641 HDDs. They are cheap and of good condition --- but ageing obviously.
The three disks were of the best class in production, as the brand new 8TB disk, of course. The metal cover was finely finished and reading sound is still strong and good. However, their SMART info shows some noncritical but still worrying indicators, e.g. read error rate, throughput performance, and seek time performance. Hope they will survive longer than 2 years.
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