diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0e3451c..b9cba81 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -82,6 +82,7 @@ For major (breaking) changes - **version 4, 3 and 2** - see end of page.
 
 | Version | Date       | Comment                                                                                             |
 | ------- | ---------- | --------------------------------------------------------------------------------------------------- |
+| 5.16.0  | 2022-12-01 | `fsSize()` added rw (win, linux, mac OS, BSD)                                                       |
 | 5.15.1  | 2022-11-29 | fix typescript typings                                                                              |
 | 5.15.0  | 2022-11-29 | `blockDevices()` added device (win, linux, mac OS)                                                  |
 | 5.14.4  | 2022-11-21 | `osInfo()` improved uefi parsing (FreeBSD)                                                          |
diff --git a/README.md b/README.md
index 8dbbbca..87e9063 100644
--- a/README.md
+++ b/README.md
@@ -112,6 +112,8 @@ si.cpu()
 
 (last 7 major and minor version releases)
 
+- Version 5.16.0: `fsSize()` added rw property
+- Version 5.15.0: `blockDevices()` added device
 - Version 5.14.0: `blockDevices()` added raid group member (linux)
 - Version 5.13.0: `networkConnections()` added process name (mac OS)
 - Version 5.12.0: `cpu()` added performance and efficiency cores
@@ -489,6 +491,7 @@ Full function reference with examples can be found at [https://systeminformation
 |                     | [0].available         | X     | X   | X   | X   |     | used in bytes                                                            |
 |                     | [0].use               | X     | X   | X   | X   |     | used in %                                                                |
 |                     | [0].mount             | X     | X   | X   | X   |     | mount point                                                              |
+|                     | [0].rw                | X     | X   | X   | X   |     | read and write (false if read only)                                      |
 | si.fsOpenFiles(cb)  | {...}                 | X     | X   | X   |     |     | count max/allocated file descriptors                                     |
 |                     | max                   | X     | X   | X   |     |     | max file descriptors                                                     |
 |                     | allocated             | X     | X   | X   |     |     | current open files count                                                 |
diff --git a/docs/filesystem.html b/docs/filesystem.html
index 2b1d3ef..e3c19a3 100644
--- a/docs/filesystem.html
+++ b/docs/filesystem.html
@@ -742,6 +742,16 @@ setInterval(function() {
                       <td></td>
                       <td>mount point</td>
                     </tr>
+                    <tr>
+                      <td></td>
+                      <td>[0].rw</td>
+                      <td>X</td>
+                      <td>X</td>
+                      <td>X</td>
+                      <td>X</td>
+                      <td></td>
+                      <td>Read/Write (false if read only)</td>
+                    </tr>
                     <tr class="example">
                       <td></td>
                       <td colspan="7">
@@ -757,7 +767,8 @@ si.fsSize().then(data => console.log(data));</code></pre class="example">
     used: 59142635520,
     available: 913434726400,
     use: 6.08,
-    mount: '/'
+    mount: '/',
+    rw: true
   },
   {
     ...
@@ -1000,4 +1011,4 @@ setInterval(function() {
   </script>
 </body>
 
-</html>
\ No newline at end of file
+</html>
diff --git a/docs/history.html b/docs/history.html
index 9ea0fe6..e4e35b7 100644
--- a/docs/history.html
+++ b/docs/history.html
@@ -57,6 +57,11 @@
                     </tr>
                   </thead>
                   <tbody>
+                    <tr>
+                      <th scope="row">5.16.0</th>
+                      <td>2022-12-01</td>
+                      <td><span class="code">fsSize()</span> added rw attribute (win, linux, mac OS, BSD)</td>
+                    </tr>
                     <tr>
                       <th scope="row">5.15.1</th>
                       <td>2022-11-29</td>
diff --git a/docs/index.html b/docs/index.html
index 868d86d..964ed7c 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -170,7 +170,7 @@
       <img class="logo" src="assets/logo.png" alt="logo">
       <div class="title">systeminformation</div>
       <div class="subtitle"><span id="typed"></span>&nbsp;</div>
-      <div class="version">New Version: <span id="version">5.15.1</span></div>
+      <div class="version">New Version: <span id="version">5.16.0</span></div>
       <button class="btn btn-light" onclick="location.href='https://github.com/sebhildebrandt/systeminformation'">View on Github <i class=" fab fa-github"></i></button>
     </div>
     <div class="down">
@@ -206,7 +206,7 @@
       </div>
       <div class="row number-section">
         <div class="col-xl-4 col-lg-4 col-md-4 col-12">
-          <div class="numbers">15,211</div>
+          <div class="numbers">15,381</div>
           <div class="title">Lines of code</div>
         </div>
         <div class="col-xl-4 col-lg-4 col-md-4 col-12">
diff --git a/lib/filesystem.js b/lib/filesystem.js
index d46f790..624cd3d 100644
--- a/lib/filesystem.js
+++ b/lib/filesystem.js
@@ -39,6 +39,7 @@ let _disk_io = {};
 function fsSize(callback) {
 
   let macOsDisks = [];
+  let osMounts = [];
 
   function getmacOsFsType(fs) {
     if (!fs.startsWith('/')) { return 'NFS'; }
@@ -86,6 +87,7 @@ function fsSize(callback) {
           const used = parseInt(((_linux || _freebsd || _openbsd || _netbsd) ? line[3] : line[2])) * 1024;
           const available = parseInt(((_linux || _freebsd || _openbsd || _netbsd) ? line[4] : line[3])) * 1024;
           const use = parseFloat((100.0 * (used / (used + available))).toFixed(2));
+          let rw = _darwin && osMounts && Object.keys(osMounts).length > 0 ? osMounts[fs] || false : null;
           line.splice(0, (_linux || _freebsd || _openbsd || _netbsd) ? 6 : 5);
           const mount = line.join(' ');
           if (!data.find(el => (el.fs === fs && el.type === fsType))) {
@@ -96,7 +98,8 @@ function fsSize(callback) {
               used,
               available,
               use,
-              mount
+              mount,
+              rw
             });
           }
         }
@@ -110,18 +113,37 @@ function fsSize(callback) {
       let data = [];
       if (_linux || _freebsd || _openbsd || _netbsd || _darwin) {
         let cmd = '';
+        macOsDisks = [];
+        osMounts = {};
         if (_darwin) {
           cmd = 'df -kP';
           try {
             macOsDisks = execSync('diskutil list').toString().split('\n').filter(line => {
               return !line.startsWith('/') && line.indexOf(':') > 0;
             });
+            execSync('mount').toString().split('\n').filter(line => {
+              return line.startsWith('/');
+            }).forEach((line) => {
+              osMounts[line.split(' ')[0]] = line.toLowerCase().indexOf('read-only') === -1;
+            });
           } catch (e) {
-            macOsDisks = [];
+            util.noop();
           }
         }
-        if (_linux) { cmd = 'df -lkPTx squashfs'; }
-        if (_freebsd || _openbsd || _netbsd) { cmd = 'df -lkPT'; }
+        if (_linux) {
+          cmd = 'df -lkPTx squashfs';
+          execSync('cat /proc/mounts').toString().split('\n').filter(line => {
+            return line.startsWith('/');
+          }).forEach((line) => {
+            osMounts[line.split(' ')[0]] = line.toLowerCase().indexOf('rw') >= 0;
+          });
+        }
+        if (_freebsd || _openbsd || _netbsd) {
+          cmd = 'df -lkPT';
+          execSync('mount').toString().split('\n').forEach((line) => {
+            osMounts[line.split(' ')[0]] = line.toLowerCase().indexOf('read-only') === -1;
+          });
+        }
         exec(cmd, { maxBuffer: 1024 * 1024 }, function (error, stdout) {
           let lines = filterLines(stdout);
           data = parseDf(lines);
@@ -151,7 +173,7 @@ function fsSize(callback) {
       if (_windows) {
         try {
           // util.wmic('logicaldisk get Caption,FileSystem,FreeSpace,Size').then((stdout) => {
-          util.powerShell('Get-CimInstance Win32_logicaldisk | select Caption,FileSystem,FreeSpace,Size | fl').then((stdout, error) => {
+          util.powerShell('Get-CimInstance Win32_logicaldisk | select Access,Caption,FileSystem,FreeSpace,Size | fl').then((stdout, error) => {
             if (!error) {
               let devices = stdout.toString().split(/\n\s*\n/);
               devices.forEach(function (device) {
@@ -159,6 +181,8 @@ function fsSize(callback) {
                 const size = util.toInt(util.getValue(lines, 'size', ':'));
                 const free = util.toInt(util.getValue(lines, 'freespace', ':'));
                 const caption = util.getValue(lines, 'caption', ':');
+                const rwValue = util.getValue(lines, 'access', ':');
+                const rw = rwValue ? (util.toInt(rwValue) !== 1) : null;
                 if (size) {
                   data.push({
                     fs: caption,
@@ -167,7 +191,8 @@ function fsSize(callback) {
                     used: size - free,
                     available: free,
                     use: parseFloat(((100.0 * (size - free)) / size).toFixed(2)),
-                    mount: caption
+                    mount: caption,
+                    rw
                   });
                 }
               });
diff --git a/lib/index.d.ts b/lib/index.d.ts
index 7c0d1dc..643c05b 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -434,6 +434,7 @@ export namespace Systeminformation {
     available: number;
     use: number;
     mount: string;
+    rw: boolean | null;
   }
 
   interface FsOpenFilesData {