their name to Glassbridge Enterprises in 2017. TDK withdrew from the data tape business in 2014. Verbatim and Quantegy both licensed LTO technology, but never manufactured their own compliance-verified media. Maxell also withdrew from the market. In addition to the data cartridges, there are also Universal Cleaning Cartridges (UCC), which work with all drives. Dimensions All formats use the same cartridge dimensions, . Colors The colors of LTO Ultrium cartridge shells are mostly consistent, though not formally standardized; HP is the notable exception. Sometimes similar, rather than identical, colors are used by different manufacturers (slate-blue and blue-gray; green, teal, and blue-green; dark red and burgundy). WORM (write once, read many) cartridges are two-tone: the top half of the shell is the normal color of that generation for that manufacturer, and the bottom half of the shell is a light gray. Memory Every LTO cartridge has a cartridge memory chip inside it. It is made up of 511, 255, or 128 blocks of memory, where each block is 32 bytes for a total of 16 KiB for LTO-6 to 8; 8 KiB for LTO-4 and 5; and 4 KiB on LTO-1 to 3 and cleaning cartridges. This memory can be read or written, one block at a time, via a non-contacting passive 13.56 MHz RF interface. This memory is used to identify tapes, to help drives discriminate between different generations of the technology, and to store tape-use information. Every LTO drive has a cartridge memory reader in it. The non-contact interface has a range of 20 mm. External readers are available, both built into tape libraries and PC based. One such reader, Veritape, connects by USB to a PC and integrates with analytical software to evaluate the quality of tapes. This device is also rebranded as the Spectra MLM Reader and the Maxell LTO Cartridge Memory Analyzer. Proxmark3 and other generic RFID readers are also able to read data. Labels The LTO cartridge label in tape library applications commonly uses the bar code symbology of USS-39. A description and definition is available from the Automatic Identification Manufacturers (AIM) specification Uniform Symbol Specification (USS-39) and the ANSI MH10.8M-1993 ANSI Barcode specification. Leader pin The tape inside an LTO cartridge is wound around a single reel. The end of the tape is attached to a perpendicular leader pin that is used by an LTO drive to reliably grasp the end of the tape