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Newbie
Posts: 7
Registered: ‎10-05-2017

Missing 6.8 GB on Sandisk ultra m3.0 64 GB

I am missing 6.8 GB on Sandisk ultra m3.0 64 GB. I can see 57.2 GB only. Does not add up by any calculation.  

64GBis57GB.jpg
SanDisk Guru
Posts: 4,244
Registered: ‎07-18-2007

Re: Missing 6.8 GB on Sandisk ultra m3.0 64 GB

what you see is normal here is the explination. I highliged the most important part of the disclaimer. 

 

https://kb.sandisk.com/app/answers/detail/a_id/46/ 

 

Why is the capacity of my device (as reported by many operating systems) different than the capacity that is listed on its label?
 

All SanDisk products include the total capacity, at an unformatted level, that is stated on the product packaging. For example, a 128GB SanDisk USB flash drive has a total capacity of 128,000,000,000 bytes at the unformatted level (where 1GB=1,000,000,000 bytes).

 

Definitions of a Megabyte:
1. Operating Systems commonly define capacity as follows:
     - Kilobyte (KB) as: 2 to the 10th power (1,024 bytes)
     - Megabyte (MB) as:  2 to the 20th power (1,024 X 1,024 bytes = 1,048,576 bytes)
     - Gigabyte (GB) as: 2 to the 30th power (1,024 X 1,024 X 1,024 bytes = 1,073,741,824 bytes)

2. Disk Drive and Flash Memory Card Manufacturers commonly define a MB as one million bytes (exactly 1,000,000 bytes) and a GB as one billion bytes (exactly 1,000,000,000 bytes). 

SanDisk defines 1 GB as 1,000,000,000 bytes.  Operating Systems define 1 GB as 1,073,741,824 BYTES.

 

Note: Some capacity is used for formatting and other functions and thus not available for data storage.

 

A portion of the total capacity is used to store certain functions including optimizations of the memory that support performance and endurance and therefore is not available for user storage. This is disclosed on our packaging and marketing materials when you see the statement "Actual user storage less."

 

As a leader in flash storage technology, SanDisk offers multiple products at different speeds and capacities to address a variety of consumer needs. To provide the optimum product for you, we're continuously improving and updating our technology, products, firmware, and design. Continual improvements and updates are made to our product (both new products and existing product lines) and can include changes to the basic file structure, formatting and other functions. These optimizations may result in variances as to the amount of memory space that is available for user storage, but are essential to performance and endurance of the products.

Newbie
Posts: 7
Registered: ‎10-05-2017

Re: Missing 6.8 GB on Sandisk ultra m3.0 64 GB

If I use the same calculations, What is 64000000000 for Sandisk equals 64000000000/1073741824 = 59.6046447753906 

It should be 59.60 GB and not 57.2 GB

 

Please clarify.

 

Thanks

Newbie
Posts: 6
Registered: ‎08-27-2017

Re: Missing 6.8 GB on Sandisk ultra m3.0 64 GB

@vikramr:

you are right. The calculations don't add up. It should be 59.60 GB. So there's about 2.5 GB actually missing.

 

But here's the thing: SanDisk says "Actual user storage less", but who knows what that means and how much it affects the storage medium. To me, it could also mean that they will only give you 32 GB, because they need the other 32 GB for some kind of wear leveling or performance improvements or whatever. SanDisk really needs to disclose this information! Also: other manufacturers don't seem to have this problem!

 

Yes, I call this fake advertisement! And if you're ordering online, you might not even be able to read the backside of the packaging!

SanDisk Guru
Posts: 16,082
Registered: ‎04-17-2008

Re: Missing 6.8 GB on Sandisk ultra m3.0 64 GB


vikramr wrote:

 

Please clarify.

 


 

I believe drlucky already did:

 

"A portion of the total capacity is used to store certain functions including optimizations of the memory that support performance and endurance and therefore is not available for user storage. "

Newbie
Posts: 7
Registered: ‎10-05-2017

Re: Missing 6.8 GB on Sandisk ultra m3.0 64 GB

No. dr lucky's calculations do not add up. The space reserved for OS is usually to demark allocated spaces and never that high. 

Newbie
Posts: 7
Registered: ‎10-05-2017

Re: Missing 6.8 GB on Sandisk ultra m3.0 64 GB

As a consumer I am concerned about such open statements which can really imply that a 64 GB could be sold as 32 GB possible?. In a competitive market driven by Standards, the company should maintain their standards. So I would look forward to Sandisk helping to address this issue. The customer support has not yet confirmed the exact space it should show instead asked me to check on Mac OS. It was a good cue. I checked various USB drives on Mac and they show higher capacity than the printed. So the 64 GB should show 64 GB+ capacity on the mac. But in my case it shows 61.51 GB on Mac and 57.2 GB on windows instead of 64 GB on mac and 59.6 GB on Windows. I still await a resolution from Sandisk customer support. 

SanDisk Guru
Posts: 2,423
Registered: ‎07-23-2010

Re: Missing 6.8 GB on Sandisk ultra m3.0 64 GB

If you are unhappy with the drive return it to where you bought it or to SanDisk.

 

Depending on where you bought it it's possible it's a counterfeit.

Ed
Important files = Backed up files
Newbie
Posts: 7
Registered: ‎10-05-2017

Re: Missing 6.8 GB on Sandisk ultra m3.0 64 GB

I can see it has an official import packaging. I have also shared the packaging picture with Sandisk. The capacity difference is so huge that I expect Sandisk support to spot a counterfeit instantly. Instead I see that customer support is dilly dallying and sharing calculations which do not add up.
SanDisk Guru
Posts: 4,244
Registered: ‎07-18-2007

Re: Missing 6.8 GB on Sandisk ultra m3.0 64 GB

i think this disclaimer in the capacity article explains it.

 

"A portion of the total capacity is used to store certain functions including optimizations of the memory that support performance and endurance and therefore is not available for user storage. "

 

there are variances in memory technologies used and the actual user available storage space may differ. 

 

this is also important to note in the disclaimer

 

This is disclosed on our packaging and marketing materials when you see the statement "Actual user storage less."

 

As a leader in flash storage technology, SanDisk offers multiple products at different speeds and capacities to address a variety of consumer needs. To provide the optimum product for you, we're continuously improving and updating our technology, products, firmware, and design. Continual improvements and updates are made to our product (both new products and existing product lines) and can include changes to the basic file structure, formatting and other functions. These optimizations may result in variances as to the amount of memory space that is available for user storage, but are essential to performance and endurance of the products.