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Author Topic: DATA CORRUPTION.  (Read 7828 times)

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A41202813GMAIL

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DATA CORRUPTION.
« on: 21. February 2015., 05:44:50 »
Hello,

All The USB Flash Drives I Own Have Small Sizes ( Up To 4GB ).

Wherever I Go, I Carry With Me 3 Of Them ( Between 2GB And 4GB ).

I Also Carry An External 500GB Hard Drive ( My Main Offline Backup - I Have Never Opened Its Enclosure - I Think It Is A SATA 2.5 Drive ).

On Different Occasions, All 3 Flash Drives Have Developed Some Sort Of Data Corruption, But I Have No Complaints About The Hard Drive.

Are Flash Drives And SSDs The Same Kind Of Technology ?

What Gives ?

Thank You.

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DATA CORRUPTION.
« on: 21. February 2015., 05:44:50 »




devnullius

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Re: DATA CORRUPTION.
« Reply #1 on: 21. February 2015., 11:28:46 »
Good question :) I asked Google...

Are Flash Drives And SSDs The Same Kind Of Technology ?

Found: http://techchannel.radioshack.com/differences-between-usb-flash-drive-ssd-2155.html

Many supplemental media options exist that enable you to add to the storage capacity of your computer including a variety of flash memory cards and drives. Two such flash-memory-based drive devices are solid-state drives and USB flash drives, which use programmable memory chips to store data rather than the magnetic platters used in standard hard drives. Both SSDs and USB flash drives both use flash-memory technology. However, if you are thinking of adding a flash-memory drive to your computer, there are some important differences should be aware of as well.


Physical Size and Usage

USB flash drives are usually about the size of a small lighter or your thumb; thus, you may hear people refer to them as thumb drives. In contrast, SSDs use the same form factors as standard desktop and laptop hard drives. SSDs come in four different widths: 1.8-inch, 2.5-inch, 3.5-inch and 5.25-inch. While you must always use a USB flash drive as an external storage device, SSDs can serve as internal or external drives. Manufacturers design SSDs primarily for use inside a desktop or laptop computer. Nevertheless, you can purchase external SSD drives. External SSDs are simply SSD drives inside enclosures that you can connect to a computer via a USB port. Alternatively, you can create an external SSD drive yourself, by purchasing an external hard-drive case with a SATA-to-USB conversion board and cable, installing the drive inside the enclosure and then connecting it to your computer. By using a 2.5-inch or 3.5-inch SSD inside an external enclosure, you also make the storage device portable just like a USB flash drive.


Speed

If you need only to copy the occasional file to a portable device so that you can share it with a friend, the speed of your flash storage drive probably isn't much of a concern. However, if you need to use a flash-memory drive constantly to copy, save or transfer files, speed may be an issue. Most USB flash drives transfer data using the USB 2.0 standard, which means that under optical conditions the devices can read data at 34MB/s (megabytes per second) and write it at 28MB/s. Some newer USB 3.0 flash drives can read and write data much faster, and the fastest ones read and write data at up to 124MB/s. SSDs are significantly faster than even the fastest USB flash drives, and usually transfer data quicker than even traditional platter-based hard drives. Like modern platter drives, SSDs connect to a computer motherboard via a SATA -- or Serial ATA -- cable. However, SSDs can transfer data at up to 360MB/s, whereas traditional drives usually cap out at rates between 120MB/s to 165MB/s. If you want to copy the contents of a 700MB file to a flash-memory drive, it would take you approximately 20 to 30 seconds with most USB drives and only less than 5 seconds in most cases with an SSD.


Capacity and Cost

When it comes to storage capacity, both SSDs and USB flash drives are considerably smaller than most platter-based hard drives. The largest commonly available USB flash drives are 256GB in size as of November 2012. Victrorinox does make a 1TB USB flash drive, but at $3000, it is out of the price range of most consumers. The largest SSDs provide 1TB of storage, but most mainstream solid-state drives hold only 128GB to 512GB of data. By comparison, traditional SATA platter hard drives are available in sizes all the way up to 4TB. Because USB flash drives use a cheaper type of flash memory, they are less inexpensive when compared to SSDs. The typical cost of a 128MB USB flash drive is about $80, while an SSD with the same storage capacity will set you back between $90 and $120 depending on the brand you buy. As you look into SSDs with larger capacities, their prices increase significantly. For example, a 512GB SSD usually sells for between $325 and $700. By comparison, major-brand 1GB platter drives often sell for well below $100. Note that all capacity and price data is current as of November 2012 and could change considerably without notice.


Reliability and Efficiency

While SSDs cost a lot more than USB flash drives, they are also more reliable. Both types of drives use NAND flash memory to store data, but not the same kind. USB flash drives use multi-level cell memory, which is much cheaper to produce than the single-level cell memory used in SSDs. The MLC memory used in USB flash drives can store 2 bits of data for every cell, resulting in larger possible storage capacities. In fact, some hybrid SSD drives use MLC memory to increase their storage capacities up to 1GB. While SLC memory does not allow for such large storage capacities, it endures much better than MLC memory.

Generally speaking, you can only read or write data to a MLC memory cell about 5,000 times. SLC increases the number of possible read/write cycles to about 50,000. The controller boards found in SSDs support wear leveling, which helps to spread read/write operations across more of the cells in the memory chips to make the drives last longer. Controllers in SSD drives also enable advanced hard drive features, such as native-command queuing that optimizes read/write requests and SMART, which enables the computer BIOS to monitor the drive in real time for potential anomalies of problems. There are many other technical reasons why SSDs perform better and are more durable than USB flash drives.

However, the bottom line is that SSDs are faster and more reliable than USB flash drives.

Karma!

Devvie
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A41202813GMAIL

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DATA CORRUPTION.
« Reply #2 on: 22. February 2015., 02:09:25 »
Thank You For Responding.

There Is A Typo:

...cost of a 128(M)B USB flash drive... >>> ...cost of a 128(G)B USB flash drive...

Cheers.

Samker

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Re: problem with corrupted Flash drives
« Reply #3 on: 22. February 2015., 10:06:11 »
...

On Different Occasions, All 3 Flash Drives Have Developed Some Sort Of Data Corruption...

...

Devvie wrote most of the things about technology... I'm interested in whether you need help with these corrupted Flash drives?

If yes, provide us little bit more information about this problem... with error codes if possible.

P.S.

I think that this topic belongs to "SCF's PC Help Center", so I moved it here: http://scforum.info/index.php/board,16.0.html


A41202813GMAIL

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DATA CORRUPTION.
« Reply #4 on: 23. February 2015., 06:58:09 »
Only A Few Files Are Corrupted.

If Necessary, What I Do Is Reformat The Drive And Start Again.

I Used The Chit Chat Because I Wanted Only To Hear Of Some Similar Experiences.

Most Of My Devices Have Been Used Only A Handful Of Times.

To Guarantee A Good Backup You Have To Use 3 Of Them, At Least - If One File Is Corrupted In Either, Maybe It Is OK In One Of The Others.

You Should Increase The Number Of Devices For Backup Purposes Because A Random Accident Can Wipe The Data, Not Because The Devices Are Too Unreliable.

I Have Never Even Seen An SSD, But I Do Not Trust In Storage Devices Without Movable Parts - Not Yet, Anyway - I Hope It Is Only A Matter Of Time.

Cheers.

---

devnullius

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Re: DATA CORRUPTION.
« Reply #5 on: 02. March 2015., 09:11:26 »
I stopped using USB flash drives a long time ago, exactly because they are more often than not only 98% accurate... I only have 1 USB drive I 100% trust; it's from Albert Heijn Supermarket and I even washed it on 60 degrees, still functions flawlessly :)

In general: all USB based storage soutions suck. It's the reason I lost my original server installation... I made a full backup (software said: 100% verified; opening image worked) only to find at restoration that 2/3th of the data couldn't be restored any longer. Reason? Incorrect volume bitmap that got auto-repaired by checkdisk... Bye bye data :(
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A41202813GMAIL

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DATA CORRUPTION.
« Reply #6 on: 02. March 2015., 20:35:33 »
Yeah, It Is Like Turtles.

So Many Do Not Reach Adulthood That The Only Way To Guarantee The Continuum Of The Species Is To Have A Lot Of Siblings.

Thank You For Confirming My Darkest Fears.

A41202813GMAIL

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DATA CORRUPTION.
« Reply #7 on: 13. May 2015., 22:58:54 »
Since The Last Week, The PCWORLD Site Has A Couple Of Negative Articles About The SSDs Fragile Reliability.

Buyer Beware.

Samker

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Re: DATA CORRUPTION IN SSD
« Reply #8 on: 17. May 2015., 08:43:32 »
Since The Last Week, The PCWORLD Site Has A Couple Of Negative Articles About The SSDs Fragile Reliability.

Buyer Beware.


Pal, thanks for information. :thumbsup:

Some link(s) to mentioned article(s) will be helpful. ;)


 

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