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LTO 8 Type M cartridge (M8)

The LTO program introduced a new capability with LTO 8 tape drives: the ability to write 9 TB (native) on a brand new LTO Ultrium 7 cartridge instead of 6 TB (native) as specified by the LTO 7 format. Such a cartridge is called an LTO 7 initialized LTO 8 Type M cartridge. These LTO 8 Type M cartridges are identifiable by using an automation barcode label ending with the last 2 characters M8.


Barcode label

Cartridge packaging

Native capacity

Tape drive compatibility



LTO Ultrium 8

12 TB




LTO Ultrium 7

9 TB




LTO Ultrium 7

6 TB

LTO 7, LTO 8

Table 1. LTO 7 and LTO 8 cartridge types

Hereafter, these cartridges will be referred to as L8, M8, and L7, respectively. Only new, unused LTO Ultrium 7 cartridges can be initialized as M8 cartridges. Once a cartridge is initialized as M8, it cannot be changed back to L7. Initialized M8 cartridges can only be written and read in an LTO 8 tape drive; LTO7 tape drives cannot read initialized M8 cartridges.

M8 cartridges can be purchased as either pre-initialized (also referred to as “labeled and initialized”) M8 data cartridges or un-initialized M8 data cartridges (M8 WORM cartridges are not supported). For either option, the barcode label is included; however, the un-initialized M8 data cartridge must first be initialized in tape libraries that support the automatic initialization of un-initialized M8 cartridges while under the control of ISV applications that recognize the M8 barcode label.

A tape cartridge is initialized when it is first loaded into a compatible tape drive and data is written by the ISV application at the beginning of tape (sometimes referred to as "labeling a tape" or "writing from BOT"). The tape drive establishes the density of the media at that time.

If an un-initialized M8 cartridge is not initialized in a tape library that supports un-initialized M8 cartridges, then the cartridge may inadvertently and silently be initialized at the L7 density (i.e., at a 6 TB native capacity) even if the barcode label states M8. This could occur with the usage of non-TS4500 tape libraries, stand-alone LTO 7 tape drives, stand-alone LTO 8 tape drives, down-level LTO 8 tape drive firmware, down-level TS4500 tape library firmware, or down-level ISV software that does not recognize that M8 cartridges should only be mounted in LTO 8 tape drives. M8 cartridges that are inadvertently initialized at the L7 density can continue to be read and written in LTO 7 and LTO 8 tape drives; however, they will remain limited to the 6 TB native capacity.

TS4500 tape library firmware version added support for un-initialized M8 cartridges in addition to support for pre-initialized M8 cartridges. The TS3500 tape library only supports pre-initialized M8 cartridges. In any tape product with M8 cartridges, the minimum LTO 8 tape drive firmware version is HB82. 

Please email or call us at 203-372-6382 to order.