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 Post subject: Shelf life of HDDs and SSDs
 Post Posted: Sat Aug 20, 2016 10:43 am 
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A paragraph from this Wikipedia article reads:

Quote:
While live recording has migrated to solid state (Panasonic P2, Sony SR MASTER or XDCAM-EX), optical disc (Sony's XDCAM) and hard disks, the high cost of solid state and the limited shelf life of hard-disk drives make them less desirable for archival use, for which tape is still used. News and production camera crews in 2013 still have cameras that use tape formats, even in HD.


Scott, can you possibly tell me the average shelf life of an Enterprise-class hard drive? How about the average shelf life of an SSD?


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 Post subject: Re: Shelf life of HDDs and SSDs
 Post Posted: Sat Aug 20, 2016 1:21 pm 
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I would rate the shelf life just about the same as the usable life. According to information published by Backblaze drives have a median lifespan of over 6 years, which means in that time about half will fail. Past that point you have a greater chance of failure than survival. According to a study by Google SSDs seem to last longer but they also have reliability problems that increase with age. Scott.


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 Post subject: Re: Shelf life of HDDs and SSDs
 Post Posted: Sun Aug 21, 2016 4:20 pm 
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Scott, is it a good idea to replace hard drives every six years even if they are Enterprise-class drives and even if they are not hooked up to a system most of the time?


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 Post subject: Re: Shelf life of HDDs and SSDs
 Post Posted: Sun Aug 21, 2016 11:35 pm 
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Not necessarily. If the drives are not in a mission critical system and especially if you have multiple backups of all the data then I generally continue to use them. I treat all drives as if they will fail at any moment. Scott.


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 Post subject: Re: Shelf life of HDDs and SSDs
 Post Posted: Thu Apr 13, 2017 9:19 pm 
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In this YouTube video, Christopher Barnatt discusses the life expectancy of SSDs. He supports SSDs, but urges that valued data be saved to no less than two drives.


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 Post subject: Re: Shelf life of HDDs and SSDs
 Post Posted: Thu Apr 13, 2017 9:43 pm 
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Apparently he knows my good friend the Captain. <g>

Image

That advice applies to important data stored on *any* medium. Scott.


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 Post subject: Re: Shelf life of HDDs and SSDs
 Post Posted: Fri Apr 14, 2017 6:24 pm 
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I thought I might post this here. I wrote to Perfect Disk, which is a disk defragmenting software about SSD defrag. Anyway here is the response I got about it,

Thanks for contacting support.

While SSD drives certainly provide a performance improvement over traditional electro-mechanical HDD drives, SSD drives also have some deficiencies – including slow erase/write speeds and life span concerns. While file fragmentation typically doesn’t affect SSD drive performance as it does for a traditional HDD drive, free space fragmentation results in slow writes and reduced life span for SSD drives.

A good article that discusses and provides some benchmarks showing that optimizing an SSD drive improves performance and extends an SSD's life span can be found at http://rtcmagazine.com/articles/view/101053

Some notable points from this article – which was written by Apacer, a company that produces industrial SSD solutions:

"Since the erase/write speed is slow compared to read, a write multiplication due to free space fragmentation can slow down I/O time severely."



To write a sector, the SSD controller needs to read and merge the data, then erase and write back a data block, which is bigger than a sector, called an "erase block." The size of the sector is 1 - 4MB, which is much bigger than the sector size. By consolidating free space, the process of transferring data between erase blocks can be reduced or eliminated.



"This means a well-designed defrag algorithm can extend an SSD’s life span."

For SSD drives, PerfectDisk provides a solution to maintain write speed and improve life span. PerfectDisk’s special SSD Optimization pass does as the article recommends – “devise a defrag strategy that will improve throughput while at the same time not incurring too many erase counts.“ It does this by specifically consolidating free space without attempting to defragment files and consolidating free space in a manner that reduces erase counts. SSD Optimize is included as a standard feature in all editions of PerfectDisk.


Susie


Any thoughts on that Scott?


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 Post subject: Re: Shelf life of HDDs and SSDs
 Post Posted: Fri Apr 14, 2017 8:40 pm 
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On an SSD the optimization of block storage is handled internally by a properly designed drive controller doing garbage collection along with TRIM command functionality. There is no benefit to defragging a modern SSD that is periodically TRIMed, in fact the additional writes will slightly shorten the life of the cells. In short I do not recommend any such software for SSDs: http://www.pcworld.com/article/2047513/ ... r-ssd.html


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