libnvme(9) API Manual libnvme(9)

# [NAME](#NAME)

struct tcg\_l0\_ns\_geometry - Namespace Geometry Reporting feature (0x0405)

# [SYNOPSIS](#SYNOPSIS)

struct tcg\_l0\_ns\_geometry {  
**\_\_u8 align;**  
**\_\_u8 rsvd1\[7];**  
**\_\_be32 logical\_block\_size;**  
**\_\_be64 alignment\_granularity;**  
**\_\_be64 lowest\_aligned\_lba;**  
};

# [Members](#Members)

[align](#align)

Flags, see *enum tcg\_l0\_ns\_geometry\_flags*

[rsvd1](#rsvd1)

Reserved

[logical\_block\_size](#logical_block_size)

Logical block size

[alignment\_granularity](#alignment_granularity)

Alignment granularity

[lowest\_aligned\_lba](#lowest_aligned_lba)

Lowest aligned LBA

# [Description](#Description)

TCG Storage Opal SSC Feature Set: Configurable Namespace Locking, section 4.2.1.

struct tcg\_l0\_ns\_geometry October 2026

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Document: tcg_l0_ns_geometry-libnvme3(2) from nvme-cli 3.2-r0 (Chainguard OS)
Source: https://github.com/linux-nvme/nvme-cli