The Ultimate SCSI2SD For Samplers Site - the Final Word

8GB Isn't 8GB, Really

2019-07-16 (Last Update: Tue, 16 Jul 2019) Garth Hjelte 0 General


Since SCSI2SD supports multiple SCSI ID's - a major feature - often we'll take a 8GB SD card and split it up 4 ways, expecting that we come away with four 2GB-sized ID's.

But that's not what happens - always the last ID comes out to something - sometimes significantly - less than 2GB. Why is this?

It's because most SD cards have a capacity of a little less than their stated capacity. Many times an 8GB SD card really has 7.6GB of capacity.

Before we ask why, just understand there's nothing you can do about it EXCEPT use a larger capacity card and waste the additional space. This isn't a big deal anyway (click here for our wasted space article.

But why is it? This is where things get interesting, if care to know. Some think it's because the card manufacturers count different, click here for a possible explanation .

But this does not fully explain the problem. We have tested many different brands, and the stated capacities are all over the map, and never are they the stated ones, no matter how you add things up.

It is also not because they are factoring in headers etc., because the capacities are raw numbers and do not include any data.

So, why? Frankly we don't know. Just deal with it. Just keep in mind that your last ID you create on your SD card will be short capacity of your other ID's, if you are going up right to "the edge".

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