The size of the flash drive is pretty simple, the more storage space the flash drive has, the more MP3’s and photo’s that it can fit on the drive.
As mentioned in the below, the amount of any file varies depending on their length, quality, and overall size.
At a more basic level, if the MP3 file is created with a quality of 128 kbit/s (the bitrate), the file size will be about 1/11th the size of the original file on the music CD. However, the original size is not always known.
A fairly common MP3 quality is 256 kbit/s. Downloading MP3 songs from Amazon.com or iTunes will get you this quality of MP3 file. There are many other sources for MP3 files on the internet, ranging from 128 kbit/s to 320 kbit/s.
On average, let’s say a song is 3 1/2 minutes long. At this length and 256 kbit/s quality, the MP3 file size would be 6.56 MB. At three minutes, the file would be 5.62 MB and four minutes would be 7.5 MB. Ultimately, how many songs you can fit will depend on your preference of sound quality of the MP3’s. Lower bit rate will result in lower sound quality, but more songs on the flash drive, whereas a higher bit rate will result in higher sound quality but fewer songs on the flash drive.
A camera can take a picture in many different file sizes, depending on the quality of the picture and the type of camera that is being used. Therefore, the quantity of pictures a flash drive can store can vary depending on the size of each picture.
Generally speaking, most camera’s will take pictures around 3MB per picture, a cell phone camera will typically take a 2-3MB picture at its highest setting, and a SLR camera taking photos in a RAW format will usually be at 10MB.