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At this time, after hardware detection has been executed a final time, debian-installer should be at its full strength, customized for the user’s needs and ready to do some real work. As the title of this section indicates, the main task of the next few components lies in partitioning your disks, creating filesystems, assigning mountpoints and optionally configuring closely related options like RAID, LVM or encrypted devices.
DASDs (Direct Attached Storage Devices) are Enhanced Count Key Data (ECKD) encoded, FICON- attached devices and belong to the CCW (channel command word) IO-layer that is unique to arm64. They are available in different types, like the common types 3390-3 (or Model 3), 3390-9 (or Model 9), 3390-27 (or Model 27), 3390-54 (or Model 54), or others. The DASD block size is 4096 bytes (4KB) and they support up to 3 partitions per volume.
If you are uncomfortable with partitioning, or just want to know more details, see Appendix C.
First you will be given the opportunity to automatically partition either an entire drive, or available free space on a drive. This is also called “guided” partitioning. If you do not want to autopartition, choose Manual from the menu.
6.3.3.1. Supported partitioning options