diff --git a/disk/disk_netbsd.go b/disk/disk_netbsd.go
index 6f1ba3f..062d773 100644
--- a/disk/disk_netbsd.go
+++ b/disk/disk_netbsd.go
@@ -14,23 +14,41 @@ import (
 
 func PartitionsWithContext(ctx context.Context, all bool) ([]PartitionStat, error) {
 	var ret []PartitionStat
+    
+    flag := uint64(1) // ST_WAIT/MNT_WAIT, see sys/fstypes.h
 
     // get required buffer size
     r, _, err = unix.Syscall6(
         483, // SYS___getvfsstat90 syscall 
         nil,
         0,
-        1, // ST_WAIT/MNT_WAIT, see sys/fstypes.h
+        uintptr(unsafe.Pointer(&flag)), 
     )
     if err != nil {
         return ret, err
     }
     mountedFsCount := uint64(r)
 
+    // calculate the buffer size
+    bufSize := sizeOfStatvfs * mountedFsCount
+    buf := make([]Statvfs, bufSize)
+
+    // request agian to get desired mount data
+    _, _, err = unix.Syscall6(
+        483,
+        uintptr(unsafe.Pointer(&buf[0])),
+        uintptr(unsafe.Pointer(&bufSize)),
+        uintptr(unsafe.Pointer(&flag)),
+    )
+    if err != nil {
+        return ret, err
+    }
+
+    for _, stat := range buf {
 		d := PartitionStat{
-			Device:     common.ByteToString(stat.F_mntfromname[:]),
-			Mountpoint: common.ByteToString(stat.F_mntonname[:]),
-			Fstype:     common.ByteToString(stat.F_fstypename[:]),
+			Device:     common.ByteToString([]byte(stat.Mntfromname[:])),
+			Mountpoint: common.ByteToString([]byte(stat.Mntonname[:])),
+			Fstype:     common.ByteToString([]byte(stat.Fstypename[:])),
 			Opts:       opts,
 		}
 
diff --git a/disk/disk_netbsd_arm64.go b/disk/disk_netbsd_arm64.go
new file mode 100644
index 0000000..9d364d4
--- /dev/null
+++ b/disk/disk_netbsd_arm64.go
@@ -0,0 +1,38 @@
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs types_netbsd.go
+
+package disk
+
+const (
+	sizeOfStatvfs = 0xce0
+)
+
+type (
+	Statvfs struct {
+		Flag		uint64
+		Bsize		uint64
+		Frsize		uint64
+		Iosize		uint64
+		Blocks		uint64
+		Bfree		uint64
+		Bavail		uint64
+		Bresvd		uint64
+		Files		uint64
+		Ffree		uint64
+		Favail		uint64
+		Fresvd		uint64
+		Syncreads	uint64
+		Syncwrites	uint64
+		Asyncreads	uint64
+		Asyncwrites	uint64
+		Fsidx		_Ctype_struct___0
+		Fsid		uint64
+		Namemax		uint64
+		Owner		uint32
+		Spare		[4]uint64
+		Fstypename	[32]uint8
+		Mntonname	[1024]uint8
+		Mntfromname	[1024]uint8
+		Mntfromlabel	[1024]uint8
+	}
+)
diff --git a/disk/types_netbsd.go b/disk/types_netbsd.go
new file mode 100644
index 0000000..25217a0
--- /dev/null
+++ b/disk/types_netbsd.go
@@ -0,0 +1,30 @@
+//go:build ignore
+// +build ignore
+
+// Hand writing: _Ctype_struct_statvfs
+
+/*
+Input to cgo -godefs.
+*/
+
+package disk
+
+/*
+#include <sys/types.h>
+#include <sys/statvfs.h>
+#include <sys/cdefs.h>
+#include <sys/featuretest.h>
+#include <sys/stdint.h>
+#include <machine/ansi.h>
+#include <sys/ansi.h>
+#include <sys/fstypes.h>
+*/
+import "C"
+
+const (
+	sizeOfStatvfs = C.sizeof_struct_statvfs
+)
+
+type (
+	Statvfs C.struct_statvfs
+)