Wednesday, July 6, 2011

IBM PCM. Are SSD becoming history?

IBM recently anounced that they have successfully developed the multi-bit chips by doubling the density of a chip and reducing errors when reading data.
The chips can store data 100x faster than existing NAND flash technology (what for SSD is about 250Mb/s). They also have high storage capacities and the power to retain data even when the power supply is cut off.
Unlike flash, these chips are very durable. They can endure at least 10 million write cycles, compared to current 30'000 up to 50'000 for SSD.
IBM plans to license the technology and expects the chips to be widely available by 2016.

More - http://hdd-compare.com/en/blog/ibm-pcm-are-ssd-becoming-history

ibm pcm

Monday, July 4, 2011

Hard disk drives RMA statistics

There are numerous criteria how to choose best hard disk drive. Performance benchmarking is one of them, prices comparison and warranty goes next. HDD manufacturer usually provide 1 to 3 or even more years of warranty.  Even if hard drive will be replaced, data stored on them will be lost irreversibly.  And here is another useful statistics – RMA statistics or how often hardware is returned to RMA service because of defect.

More - http://hdd-compare.com/en/blog/hard-disk-drives-rma-statistics

Hard disk manufacturers who left industry or backrupted

The dark side of free market is concurrency what forces some companies to be sold or banckrupt. The same happens in storage industry. That means after a couple of years you can find hard disk drive without any information only because it is not produced any more and company did it is left business.

More - http://hdd-compare.com/en/blog/hard-disk-manufacturers-out-of-the-game

SSD MLC vs SLC

SLC devices store 1 bit per flash cell, MLC devices store 2 bits per cell. The reason MLC drives are cheaper is because a chip half the size (and cost) can store the same amount of data. 
Single-level cell (SLC) SSD drives are faster and more reliable.
Multi-level cell (MLC) SSD drives are slower, cheaper but less reliable.

More - http://hdd-compare.com/en/blog/ssd-mlc-vs-slc

What is SSD TRIM?

TRIM as a garbage collector for your SSD. Normally, when you delete data on a disk, whether SSD or standard magnetic hard drive, the data isn’t immediately scrubbed. Instead, it’s marked as overwriteable, so when the disk runs out of fresh blocks to write to, it goes back and writes over deleted files.

More - http://hdd-compare.com/en/blog/what-is-ssd-trim

SSD write endurance

 In the early days of flash SSDs managing this was a real headache for oems and users. The maximum number of write cycles to an address block - the endurance - was initially small (about 10,000 write cycles in 1994, rising to 100,000 in 1997).

More - http://hdd-compare.com/en/blog/ssd-write-endurance

Average lifespan of various data storage media

It is know, that regular hard disk drives (ie. platted) can crash and do crash somethimes. More actual this question becom when SSD disks konquered into the storage market ie. - how reliable are SSD?. The same can be asked about all kind of media. But who might imagine, that most durable are - stoned tabletes! :)

More - http://hdd-compare.com/en/blog/average-lifespan-of-various-data-storage-media