Types of storage

Storage area network (SAN) SAN provides access at block-addressing (raw) level, leaving it to attaching systems to manage data or file systems within the provided capacity. SAN is commonly associated with Fibre Channel networks.
Network-attached storage (NAS) NAS presents and manages file systems to client computers over a local area network, a private wide area network, or in the case of online file storage, over the Internet. NAS is commonly associated with the NFS and CIFS/SMB protocols.

Holographic storage HVD uses the conventional CD/DVD pit layer for addressing the disc, on top of which is the holographic recording layer. A red laser reads the addresses, while a green or blue laser reads and writes the holograms. Whether this technology has a future remains to be seen.
Blu-ray Conventional or pre-BD-XL Blu-ray discs contain 25 GB per layer, with dual-layer discs (50 GB) being the industry standard for feature-length video discs. Triple-layer discs (100 GB) and quadruple-layer discs (128 GB) are available for BD-XL re-writer drives.
HD DVD 15 GB (single layer) 30 GB (dual layer)
DVD physical DVD±R 4.70GB, DVD±RW 4.70GB, DVD-RAM 4.70GB, DVD±R DL 8.55GB, MiniDVD 1.46GB, MiniDVD DL 2.66GB
CD physical Audio CD, Super Audio CD, CD-MIDI, CD-ROM, Video CD (VCD), Super Video CD, Photo CD, CD-i, CD-i Ready, Enhanced Music CD (CD+), VinylDisc. Capacity is typically up to 700 MiB (up to 80 minutes audio).
Compact Flash A flash memory mass storage device used mainly in portable electronic devices. 2 MB to 512 GB
iPOD A line of portable media players and multi-purpose pocket computers designed and marketed by Apple Inc. 2, 16, 32, 64 or 128 GB
Zune A discontinued brand of digital media products and services marketed by Microsoft. 4, 8, 16, 32, and 64 GB flash drive and 30, 80, and 120 GB hard drive
Flash memory card An electronic flash memory data storage device used for storing digital information, commonly used in portable electronic devices. 128 MB - 2 TB+
USB flash drives Universally compatible across most non-mobile computer platforms. 1 TB+
Memory stick (MS) A removable flash memory card format. 128 MB (Original), 32 GB (PRO Series), 2 TB (XC Series)
Secure Digital A non-volatile memory card for use in portable devices. SDSC (SD) 1 MB to 2 GB (some 4 GB were made), SDHC 4 GB to 32 GB, SDXC 64 GB to 2 TB, SDUC 4 TB to 128 TB
Smart Media (SM) A flash memory card standard by Toshiba, no longer manufactured. 2 MB to 128 MB
Floppy disk A type of disk storage composed of a disk of thin and flexible magnetic storage medium. From 87.5 kB to 240.75 MB
Magnetic tape Magnetic tape was first used to record computer data in 1951 on the Eckert-Mauchly UNIVAC I. In 2014, Sony announced a new tape storage technology with a capacity of 185 TB and Fujifilm announced a 154 TB tape cartridge. In 2017 Sony announced a 330 TB version.
Carousel memory A type of secondary storage for computers, created by Erik Stemme and Gunnar Stenudd, first shown at an exhibition in Paris in 1958. ~ 2560 kilobytes
Paper data storage In the late 1880s Herman Hollerith invented the recording of data on a medium that could then be read by a machine. Many early digital computers used punched cards, often prepared using keypunch machines, as the primary medium for input of both computer programs and data. Each card can contain 64 bytes of 8-bit-per-byte binary coded data.