content_image/984162.jpg content_image/984163.jpg
Figure 3-5 shows an example of the media types: A full length read/write tape on the left, WORM cartridges in the middle, and economy read/write cartridges on the right. The WORM cartridges have a platinum-colored shell, and the read/write cartridges have a black shell. 

<img src='content_image/984162.jpg'>

## Labels 

The 3592 cartridges use a media label to describe the cartridge type. Figure 3-6 shows a 3592 JE cartridge label. In tape libraries, the library vision system identifies the types of cartridges during an inventory operation. The vision system reads a volume serial number (VOLSER), which is on the label on the edge of the cartridge. The VOLSER contains 1 - 6 characters, which are left-aligned on the label. If fewer than 6 characters are used, spaces are added. The media type is indicated by the seventh and eighth characters. 

<img src='content_image/984163.jpg'>

## Cleaning cartridges 

One cleaning cartridge is designed specifically for the 3592 drives. As with the data cartridges, the 3592 cleaning cartridges are not interchangeable with any other model cleaning cartridges (for example, LTO cleaning cartridges). Therefore, both types of cleaning cartridges must be inserted into the library if there are both types of drives in the environment. 

The cleaning cartridge also contains a cartridge memory device, which automatically tracks the number of times that it was used. Cleaning cartridges must be replaced after 50 cleaning cycles. 

The physical characteristics of the 3592 cleaning cartridge can be used to distinguish it from the 3592 data cartridges. The product label on the top of the cartridge is white with the word “cleaning” printed on it. Instead of the write-pr otect switch, there is a non-moveable light gray block, which is shown as 1 in Figure 3-7 on page 124. The cartridge door is also light gray. If cleaning cartridges with pre-attached labels are ordered, the first 3 characters of the VOLSER are CLN, as identified by the number 2 label in Figure 3-7 on page 124. 

