It depends what you want to store on it, but to give you an idea, it will hold around:
4,000 photos
900 MP3's
4 Feature length DVD quality movies.
4gb
Up to 64 GBs
15551698
It depends on the size of the USB. USB's come in anything from 32MB - 32GB. You can get bigger than this as well, but you are better off buying a portable hardrive once you goo over the 32GB. How much fits on them depends on what you are putting on, for example a 1GB drive will hold most DVD quality films, but you will need a 4GB if doing HD. I hope this helps.
It depends on how many gigs the flash drive can hold. If you are windows, here is a good way to figure out how much if it isn't on the actual flash drive: first open up windows explorer, and on the left hand side it should say favorites, library's, and computer. Click on computer, and then right click click on the flash drive that you want to know the memory for. it should show you a pie chart of how much the device has on it, and has left.
YES
When it comes to flash drives and SSD's, bigger has more space and its faster. Going from 4GB to 8GB will not be a noticeable effect. Only 2GB to 120GB will be noticable.
it matters on what stuff you have on it.
A couple thousand depending on picture size.
By Simply Converting GB Into KB One Can Determine Approximately How Many 25 Pixel Photos a 4GB USB Will Hold. the USB Should Hold About 16772 Photos. Howver Depending on the Quality of Each Photo This Could Vary.
A flash drive can hold anywhere from 256 MB to 8 GB.
A USB Flash drive can be formatted with 2 different types of file system. The FAT32 file system, does not support files of a larger size than 4gb, so transferring files larger than 4gb is not possible. It is recommended to format your flash drive with the NT file system ( NTFS ) which also offers a faster access time.