This is often unclear (see also Hans’s previous answer, which is technically incorrect).In practice, it depends on the context in which the prefix is used (decimal or binary).
Producers of storage media (hard disks, USB sticks, etc.) handle decimal (the correct application of the SI prefix), and in that context the prefix means “tera-” 10 ^ 12 (also known as 1000 ^ 4) or 1 trillion and the prefix “giga-” 10 ^ 9 (also known as 1000 ^ 3) or 1 billion.It follows that there are 1000 GigaBytes in 1 TeraByte.
This is also how these SI prefixes are defined and how they are used in all cases (one kilometer is 1000 meters, obviously not 1024 meters).The only exception to this is the computer world, where storage media producers use the correct prefixes and in almost all other cases the incorrect binary variant is used.
In the computer world the SI prefixes “tera-” and “giga-” are thus often wrongly used and a power of 2 is meant (binary) instead of the (sound) power of 10 (decimal).For example, the binary variant is used to express the speed of data transfer, but (to keep it confusing) also display storage space of storage media in operating systems such as Windows and other software.
In this context, the prefix means “tera-” 2 ^ 40 (also known as 1024 ^ 4) or 1,099,511,627,776 and the prefix “giga-” 2 ^ 30 (also known as 1024 ^ 3) or 1,073,741,824.It follows that in this context there are 1024 “GigaBytes” (actually GibiBytes) in 1 “TeraByte” (actually Tebi Byte).
This different usage results in the confusing fact that if you purchase a “1 TeraByte” hard drive it actually has 10 ^ 12 or 1 trillion bytes of storage space, but, because an operating system like Windows has the (incorrect) binary Variant (and therefore assumes that 1Tb is 2 ^ 40 or 1,099,511,627,776 bytes), the storage space of the hard drive in Windows is not displayed as “1Tb” (or “1000Gb”) but as 931Gb.
In fact, in these contexts the right SI prefixes should now be used (which were set in 1998 to put an end to this confusion), namely “Gibi-” (GibiByte or GiB) and “Tebi-” (Tebi Byte or TiB).There are 1024 GiB in 1 TiB. But unfortunately, this is still too little used and the confusion continues to persist.
For further explanations see: multiples of bytes-Wikipedia
1Tb = 1000Gb According to the SI system in general (all non-computer applications), but also according to producers of storage media for computers.
1Tb = 1024Gb According to operating systems and other software for computers (where there should actually be 1TiB = 1024GiB used).
1024 MB should be it.When we go to the USB stick, HDD disk and SSD drive look. So look at the bits and zeros