diff --git a/api_client.py b/api_client.py
index 8c1a01b..9aa75e9 100644
--- a/api_client.py
+++ b/api_client.py
@@ -60,7 +60,7 @@ class ApiClient:
             print(f"Upload fail: {e}")
 
     def load_bytes(self, filename, folder):
-        hardware = get_hardware_info()
+        hardware_str = get_hardware_info()
 
         if self.token is None:
             self.login()
@@ -73,7 +73,7 @@ class ApiClient:
         payload = json.dumps(
             {
                 "password": self.credentials.password,
-                "hardware": hardware.to_json_object(),
+                "hardware": hardware_str,
                 "fileName": filename
             }, indent=4)
         response = requests.post(url, data=payload, headers=headers, stream=True)
diff --git a/hardware_service.py b/hardware_service.py
index adb9cfb..979d7d4 100644
--- a/hardware_service.py
+++ b/hardware_service.py
@@ -1,65 +1,35 @@
 import os
 import subprocess
 
-import psutil
-
-
-class HardwareInfo:
-    def __init__(self, cpu, gpu, memory, mac_address):
-        self.cpu = cpu
-        self.gpu = gpu
-        self.memory = memory
-        self.mac_address = mac_address
-
-    def to_json_object(self):
-        return {
-            "CPU": self.cpu,
-            "GPU": self.gpu,
-            "MacAddress": self.mac_address,
-            "Memory": self.memory
-        }
-
-    def __str__(self):
-        return f'CPU: {self.cpu}. GPU: {self.gpu}. Memory: {self.memory}. MAC Address: {self.mac_address}'
-
-
-def get_mac_address(interface="Ethernet"):
-    addresses = psutil.net_if_addrs()
-    for interface_name, interface_info in addresses.items():
-        if interface_name == interface:
-            for addr in interface_info:
-                if addr.family == psutil.AF_LINK:
-                    return addr.address.replace('-', '')
-    return None
-
 
 def get_hardware_info():
-    res = subprocess.check_output("ver", shell=True).decode('utf-8')
-    if "Microsoft Windows" in res:
-        is_windows = True
-    else:
-        is_windows = False
-
-    if is_windows:
+    if os.name == 'nt':  # windows
         os_command = (
             "powershell -Command \""
             "Get-CimInstance -ClassName Win32_Processor | Select-Object -ExpandProperty Name | Write-Output; "
             "Get-CimInstance -ClassName Win32_VideoController | Select-Object -ExpandProperty Name | Write-Output; "
-            "Get-CimInstance -ClassName Win32_OperatingSystem | Select-Object -ExpandProperty TotalVisibleMemorySize | Write-Output"
+            "Get-CimInstance -ClassName Win32_OperatingSystem | Select-Object -ExpandProperty TotalVisibleMemorySize | Write-Output; "
+            "(Get-Disk | Where-Object {$_.IsSystem -eq $true}).SerialNumber"
             "\""
         )
     else:
         os_command = (
-            "/bin/bash -c \" lscpu | grep 'Model name:' | cut -d':' -f2 && "
+            "lscpu | grep 'Model name:' | cut -d':' -f2 && "
             "lspci | grep VGA | cut -d':' -f3 && "
-            "free -g | grep Mem: | awk '{print $2}' && \""
+            "free -k | awk '/^Mem:/ {print $2}' && " 
+            "cat /sys/block/sda/device/vpd_pg80 2>/dev/null || cat /sys/block/sda/device/serial 2>/dev/null"
         )
-    result = subprocess.check_output(os_command, shell=True).decode('utf-8')
-    lines = [line.strip() for line in result.splitlines() if line.strip()]
 
-    cpu = lines[0].replace("Name=", "").replace("  ", " ")
-    gpu = lines[1].replace("Name=", "").replace("  ", " ")
-    memory = lines[2].replace("TotalVisibleMemorySize=", "").replace("  ", " ")
-    mac_address = get_mac_address()
+    result = subprocess.check_output(os_command, shell=True).decode('utf-8', errors='ignore')
+    lines = [line.replace("  ", " ").replace("Name=", "").strip('\x00\x14 \t\n\r\v\f') for line in result.splitlines() if line.strip()]
 
-    return HardwareInfo(cpu, gpu, memory, mac_address)
\ No newline at end of file
+    cpu = lines[0]
+    gpu = lines[1]
+
+    # could be multiple gpus, that's why take memory and drive from the 2 last lines
+    len_lines = len(lines)
+    memory = lines[len_lines - 2].replace("TotalVisibleMemorySize=", "")
+    drive_serial = lines[len_lines - 1]
+
+    res = f'CPU: {cpu}. GPU: {gpu}. Memory: {memory}. DriveSerial: {drive_serial}'
+    return res