diff --git a/USBHost_t36.h b/USBHost_t36.h
index 25f3950..d44deeb 100644
--- a/USBHost_t36.h
+++ b/USBHost_t36.h
@@ -56,7 +56,7 @@
 // your best effort to read chapter 4 before asking USB questions!
 
 
-#define USBHOST_PRINT_DEBUG
+//#define USBHOST_PRINT_DEBUG
 
 /************************************************/
 /*  Data Types                                  */
@@ -140,13 +140,22 @@ typedef union {
  };
 } setup_t;
 
+typedef struct {
+	enum {STRING_BUF_SIZE=50};
+	enum {STR_ID_MAN=0, STR_ID_PROD, STR_ID_SERIAL, STR_ID_CNT};
+	uint8_t iStrings[STR_ID_CNT];	// Index into array for the three indexes
+	uint8_t buffer[STRING_BUF_SIZE];
+} strbuf_t;
+
+#define DEVICE_STRUCT_STRING_BUF_SIZE 50
+
 // Device_t holds all the information about a USB device
-#define DEVICE_STRUCT_STRING_BUF_SIZE 48
 struct Device_struct {
 	Pipe_t   *control_pipe;
 	Pipe_t   *data_pipes;
 	Device_t *next;
 	USBDriver *drivers;
+	strbuf_t *strbuf;
 	uint8_t  speed; // 0=12, 1=1.5, 2=480 Mbit/sec
 	uint8_t  address;
 	uint8_t  hub_address;
@@ -160,8 +169,6 @@ struct Device_struct {
 	uint16_t idVendor;
 	uint16_t idProduct;
 	uint16_t LanguageID;
-	uint8_t	 string_buf[DEVICE_STRUCT_STRING_BUF_SIZE]; // Probably want a place to allocate fewer of these...
-	uint8_t	 iStrings[3];			// 3 indexes - vendor string, product string, serial number. 
 };
 
 // Pipe_t holes all information about each USB endpoint/pipe
@@ -248,6 +255,7 @@ protected:
 	static void contribute_Devices(Device_t *devices, uint32_t num);
 	static void contribute_Pipes(Pipe_t *pipes, uint32_t num);
 	static void contribute_Transfers(Transfer_t *transfers, uint32_t num);
+	static void contribute_String_Buffers(strbuf_t *strbuf, uint32_t num);
 	static volatile bool enumeration_busy;
 private:
 	static void isr();
@@ -263,6 +271,8 @@ private:
 	static void free_Pipe(Pipe_t *q);
 	static Transfer_t * allocate_Transfer(void);
 	static void free_Transfer(Transfer_t *q);
+	static strbuf_t * allocate_string_buffer(void);
+	static void free_string_buffer(strbuf_t *strbuf);
 	static bool allocate_interrupt_pipe_bandwidth(Pipe_t *pipe,
 		uint32_t maxlen, uint32_t interval);
 	static void add_qh_to_periodic_schedule(Pipe_t *pipe);
@@ -356,9 +366,12 @@ public:
 	uint16_t idVendor() { return (device != nullptr) ? device->idVendor : 0; }
 	uint16_t idProduct() { return (device != nullptr) ? device->idProduct : 0; }
 
-	const uint8_t *manufacturer() { return (device != nullptr) ? &(device->string_buf[device->iStrings[0]]) : nullptr; }
-	const uint8_t *product() { return (device != nullptr) ? &(device->string_buf[device->iStrings[1]]) : nullptr; }
-	const uint8_t *serialNumber() { return (device != nullptr) ? &(device->string_buf[device->iStrings[2]]) : nullptr; }
+	const uint8_t *manufacturer() 
+		{  return  ((device == nullptr) || (device->strbuf == nullptr)) ? nullptr : &device->strbuf->buffer[device->strbuf->iStrings[strbuf_t::STR_ID_MAN]]; }
+	const uint8_t *product() 
+		{  return  ((device == nullptr) || (device->strbuf == nullptr)) ? nullptr : &device->strbuf->buffer[device->strbuf->iStrings[strbuf_t::STR_ID_PROD]]; }
+	const uint8_t *serialNumber()
+		{  return  ((device == nullptr) || (device->strbuf == nullptr)) ? nullptr : &device->strbuf->buffer[device->strbuf->iStrings[strbuf_t::STR_ID_SERIAL]]; }
 
 	// TODO: user-level functions
 	// check if device is bound/active/online
@@ -415,7 +428,6 @@ protected:
 	// wish to claim any device or interface (eg, if getting data
 	// from the HID parser).
 	Device_t *device;
-
 	friend class USBHost;
 };
 
@@ -445,6 +457,13 @@ public:
 	operator bool() { return (mydevice != nullptr); }
 	uint16_t idVendor() { return (mydevice != nullptr) ? mydevice->idVendor : 0; }
 	uint16_t idProduct() { return (mydevice != nullptr) ? mydevice->idProduct : 0; }
+	const uint8_t *manufacturer() 
+		{  return  ((mydevice == nullptr) || (mydevice->strbuf == nullptr)) ? nullptr : &mydevice->strbuf->buffer[mydevice->strbuf->iStrings[strbuf_t::STR_ID_MAN]]; }
+	const uint8_t *product() 
+		{  return  ((mydevice == nullptr) || (mydevice->strbuf == nullptr)) ? nullptr : &mydevice->strbuf->buffer[mydevice->strbuf->iStrings[strbuf_t::STR_ID_PROD]]; }
+	const uint8_t *serialNumber()
+		{  return  ((mydevice == nullptr) || (mydevice->strbuf == nullptr)) ? nullptr : &mydevice->strbuf->buffer[mydevice->strbuf->iStrings[strbuf_t::STR_ID_SERIAL]]; }
+
 private:
 	virtual bool claim_collection(Device_t *dev, uint32_t topusage);
 	virtual void hid_input_begin(uint32_t topusage, uint32_t type, int lgmin, int lgmax);
@@ -508,6 +527,7 @@ private:
 	Device_t mydevices[MAXPORTS];
 	Pipe_t mypipes[2] __attribute__ ((aligned(32)));
 	Transfer_t mytransfers[4] __attribute__ ((aligned(32)));
+	strbuf_t mystring_bufs[1];
 	USBDriverTimer debouncetimer;
 	USBDriverTimer resettimer;
 	setup_t setup;
@@ -572,6 +592,7 @@ private:
 	bool use_report_id;
 	Pipe_t mypipes[3] __attribute__ ((aligned(32)));
 	Transfer_t mytransfers[4] __attribute__ ((aligned(32)));
+	strbuf_t mystring_bufs[1];
 };
 
 
@@ -634,6 +655,7 @@ private:
 	bool processing_new_data_ = false;
 	Pipe_t mypipes[2] __attribute__ ((aligned(32)));
 	Transfer_t mytransfers[4] __attribute__ ((aligned(32)));
+	strbuf_t mystring_bufs[1];
 };
 
 class MIDIDevice : public USBDriver {
@@ -777,6 +799,7 @@ private:
 	void (*handleTimeCodeQuarterFrame)(uint16_t data);
 	Pipe_t mypipes[3] __attribute__ ((aligned(32)));
 	Transfer_t mytransfers[7] __attribute__ ((aligned(32)));
+	strbuf_t mystring_bufs[1];
 };
 
 
@@ -810,6 +833,7 @@ private:
 private:
 	Pipe_t mypipes[3] __attribute__ ((aligned(32)));
 	Transfer_t mytransfers[7] __attribute__ ((aligned(32)));
+	strbuf_t mystring_bufs[1];
 	USBDriverTimer txtimer;
 	uint32_t bigbuffer[(BUFFER_SIZE+3)/4];
 	setup_t setup;
@@ -858,6 +882,7 @@ private:
 private:
 	Pipe_t mypipes[2] __attribute__ ((aligned(32)));
 	Transfer_t mytransfers[3] __attribute__ ((aligned(32)));
+	strbuf_t mystring_bufs[1];
 	//USBDriverTimer txtimer;
 	USBDriverTimer updatetimer;
 	Pipe_t *rxpipe;
diff --git a/antplus.cpp b/antplus.cpp
index e818e1f..dd48306 100644
--- a/antplus.cpp
+++ b/antplus.cpp
@@ -53,6 +53,7 @@ void AntPlus::init()
 {
 	contribute_Pipes(mypipes, sizeof(mypipes)/sizeof(Pipe_t));
 	contribute_Transfers(mytransfers, sizeof(mytransfers)/sizeof(Transfer_t));
+	contribute_String_Buffers(mystring_bufs, sizeof(mystring_bufs)/sizeof(strbuf_t));
 	driver_ready_for_device(this);
 	callbackFunc = NULL;
 }
diff --git a/enumeration.cpp b/enumeration.cpp
index 7775fae..d280706 100644
--- a/enumeration.cpp
+++ b/enumeration.cpp
@@ -119,6 +119,7 @@ Device_t * USBHost::new_Device(uint32_t speed, uint32_t hub_addr, uint32_t hub_p
 		free_Device(dev);
 		return NULL;
 	}
+	dev->strbuf = allocate_string_buffer();  // try to allocate a string buffer; 
 	dev->control_pipe->callback_function = &enumeration;
 	dev->control_pipe->direction = 1; // 1=IN
 	// Here is where the enumeration process officially begins.
@@ -203,10 +204,6 @@ void USBHost::enumeration(const Transfer_t *transfer)
 			dev->enum_state = 4;
 			return;
 		case 4: // parse Language ID
-			dev->iStrings[0] = 0;  // Set indexes into string buffer to say not there...
-			dev->iStrings[1] = 0;
-			dev->iStrings[2] = 0;
-			dev->string_buf[0] = 0;	// have trailing NULL..
 			if (enumbuf[4] < 4 || enumbuf[5] != 3) {
 				dev->enum_state = 11;
 			} else {
@@ -294,28 +291,31 @@ void USBHost::enumeration(const Transfer_t *transfer)
 }
 
 void  USBHost::convertStringDescriptorToASCIIString(uint8_t string_index, Device_t *dev, const Transfer_t *transfer) {
+	strbuf_t *strbuf = dev->strbuf; 
+	if (!strbuf) return;	// don't have a buffer
+
 	uint8_t *buffer = (uint8_t*)transfer->buffer;
-	uint8_t buf_index = string_index? dev->iStrings[string_index]+1 : 0;
+	uint8_t buf_index = string_index? strbuf->iStrings[string_index]+1 : 0;
 
 	// Try to verify - The first byte should be length and the 2nd byte should be 0x3
 	if (!buffer || (buffer[1] != 0x3)) {
 		return;	// No string so can simply return
 	}
 
-	dev->iStrings[string_index] = buf_index;	// remember our starting positio
+	strbuf->iStrings[string_index] = buf_index;	// remember our starting positio
 	uint8_t count_bytes_returned = buffer[0];
 	if ((buf_index + count_bytes_returned/2) >= DEVICE_STRUCT_STRING_BUF_SIZE)
 		count_bytes_returned = (DEVICE_STRUCT_STRING_BUF_SIZE - buf_index) * 2;
 
 	// Now copy into our storage buffer. 
 	for (uint8_t i = 2; (i < count_bytes_returned) && (buf_index < (DEVICE_STRUCT_STRING_BUF_SIZE -1)); i += 2) {
-		dev->string_buf[buf_index++] = buffer[i];
+		strbuf->buffer[buf_index++] = buffer[i];
 	} 
-	dev->string_buf[buf_index] = 0;	// null terminate. 
+	strbuf->buffer[buf_index] = 0;	// null terminate. 
 
 	// Update other indexes to point to null character
 	while (++string_index < 3) {
-		dev->iStrings[string_index] = buf_index;	// point to trailing NULL character
+		strbuf->iStrings[string_index] = buf_index;	// point to trailing NULL character
 	}
 }
 
@@ -461,6 +461,9 @@ void USBHost::disconnect_Device(Device_t *dev)
 				prev_dev->next = p->next;
 			}
 			println("removed Device_t from devlist");
+			if (p->strbuf != nullptr ) {
+				free_string_buffer(p->strbuf);
+			}
 			free_Device(p);
 			break;
 		}
diff --git a/examples/Mouse/Mouse.ino b/examples/Mouse/Mouse.ino
index 0bbe298..14955a9 100644
--- a/examples/Mouse/Mouse.ino
+++ b/examples/Mouse/Mouse.ino
@@ -8,6 +8,7 @@ USBHost myusb;
 USBHub hub1(myusb);
 USBHub hub2(myusb);
 USBHub hub3(myusb);
+USBHub hub4(myusb);
 KeyboardController keyboard1(myusb);
 KeyboardController keyboard2(myusb);
 KeyboardHIDExtrasController hidextras(myusb);
@@ -19,15 +20,23 @@ USBHIDParser hid5(myusb);
 MouseController mouse1(myusb);
 JoystickController joystick1(myusb);
 
-USBDriver *drivers[] = {&hub1, &hub2, &hub3, &keyboard1, &keyboard2, &hid1, &hid2, &hid3, &hid4, &hid5};
-#define CNT_DEVICES (sizeof(drivers)/sizeof(drivers[1]))
-const char * driver_names[CNT_DEVICES] = {"Hub1","Hub2","Hub3", "KB1", "KB2", "HID1", "HID2", "HID3", "HID4", "HID5" };
+USBDriver *drivers[] = {&hub1, &hub2, &hub3, &hub4, &keyboard1, &keyboard2, &hid1, &hid2, &hid3, &hid4, &hid5};
+#define CNT_DEVICES (sizeof(drivers)/sizeof(drivers[0]))
+const char * driver_names[CNT_DEVICES] = {"Hub1","Hub2", "Hub3", "Hub4" "KB1", "KB2", "HID1", "HID2", "HID3", "HID4", "HID5" };
 bool driver_active[CNT_DEVICES] = {false, false, false, false};
 
+// Lets also look at HID Input devices
+USBHIDInput *hiddrivers[] = {&mouse1, &joystick1};
+#define CNT_HIDDEVICES (sizeof(hiddrivers)/sizeof(hiddrivers[0]))
+const char * hid_driver_names[CNT_DEVICES] = {"Mouse1","Joystick1"};
+bool hid_driver_active[CNT_DEVICES] = {false, false};
+
+
 void setup()
 {
   while (!Serial) ; // wait for Arduino Serial Monitor
   Serial.println("\n\nUSB Host Testing");
+  Serial.println(sizeof(USBHub), DEC);
   myusb.begin();
   keyboard1.attachPress(OnPress);
   keyboard2.attachPress(OnPress);
@@ -59,6 +68,27 @@ void loop()
     }
   }
 
+  for (uint8_t i = 0; i < CNT_HIDDEVICES; i++) {
+    if (*hiddrivers[i] != hid_driver_active[i]) {
+      if (hid_driver_active[i]) {
+        Serial.printf("*** HID Device %s - disconnected ***\n", hid_driver_names[i]);
+        hid_driver_active[i] = false;
+      } else {
+        Serial.printf("*** HID Device %s %x:%x - connected ***\n", hid_driver_names[i], hiddrivers[i]->idVendor(), hiddrivers[i]->idProduct());
+        hid_driver_active[i] = true;
+
+        const uint8_t *psz = hiddrivers[i]->manufacturer();
+        if (psz && *psz) Serial.printf("  manufacturer: %s\n", psz);
+        psz = hiddrivers[i]->product();
+        if (psz && *psz) Serial.printf("  product: %s\n", psz);
+        psz = hiddrivers[i]->serialNumber();
+        if (psz && *psz) Serial.printf("  Serial: %s\n", psz);
+      }
+    }
+  }
+
+
+
   if(mouse1.available()) {
     Serial.print("Mouse: buttons = ");
     Serial.print(mouse1.getButtons());
diff --git a/hid.cpp b/hid.cpp
index 5a027db..2d320b9 100644
--- a/hid.cpp
+++ b/hid.cpp
@@ -39,6 +39,7 @@ void USBHIDParser::init()
 {
 	contribute_Pipes(mypipes, sizeof(mypipes)/sizeof(Pipe_t));
 	contribute_Transfers(mytransfers, sizeof(mytransfers)/sizeof(Transfer_t));
+	contribute_String_Buffers(mystring_bufs, sizeof(mystring_bufs)/sizeof(strbuf_t));
 	driver_ready_for_device(this);
 }
 
diff --git a/hub.cpp b/hub.cpp
index a86547b..e3421f0 100644
--- a/hub.cpp
+++ b/hub.cpp
@@ -37,6 +37,7 @@ void USBHub::init()
 	contribute_Devices(mydevices, sizeof(mydevices)/sizeof(Device_t));
 	contribute_Pipes(mypipes, sizeof(mypipes)/sizeof(Pipe_t));
 	contribute_Transfers(mytransfers, sizeof(mytransfers)/sizeof(Transfer_t));
+	contribute_String_Buffers(mystring_bufs, sizeof(mystring_bufs)/sizeof(strbuf_t));
 	driver_ready_for_device(this);
 }
 
diff --git a/keyboard.cpp b/keyboard.cpp
index 5dbc92c..2fb11a8 100644
--- a/keyboard.cpp
+++ b/keyboard.cpp
@@ -96,6 +96,7 @@ void KeyboardController::init()
 {
 	contribute_Pipes(mypipes, sizeof(mypipes)/sizeof(Pipe_t));
 	contribute_Transfers(mytransfers, sizeof(mytransfers)/sizeof(Transfer_t));
+	contribute_String_Buffers(mystring_bufs, sizeof(mystring_bufs)/sizeof(strbuf_t));
 	driver_ready_for_device(this);
 }
 
diff --git a/memory.cpp b/memory.cpp
index 2be4ed6..c325fb3 100644
--- a/memory.cpp
+++ b/memory.cpp
@@ -53,7 +53,7 @@
 static Device_t * free_Device_list = NULL;
 static Pipe_t * free_Pipe_list = NULL;
 static Transfer_t * free_Transfer_list = NULL;
-
+static strbuf_t * free_strbuf_list = NULL;
 // A small amount of non-driver memory, just to get things started
 // TODO: is this really necessary?  Can these be eliminated, so we
 // use only memory from the drivers?
@@ -107,6 +107,25 @@ void USBHost::free_Transfer(Transfer_t *transfer)
 	free_Transfer_list = transfer;
 }
 
+strbuf_t * USBHost::allocate_string_buffer(void)
+{
+	strbuf_t *strbuf = free_strbuf_list;
+	if (strbuf) {
+		free_strbuf_list = *(strbuf_t **)strbuf;
+		strbuf->iStrings[strbuf_t::STR_ID_MAN] = 0;  // Set indexes into string buffer to say not there...
+		strbuf->iStrings[strbuf_t::STR_ID_PROD] = 0;
+		strbuf->iStrings[strbuf_t::STR_ID_SERIAL] = 0;
+		strbuf->buffer[0] = 0;	// have trailing NULL..
+	} 
+	return strbuf;
+}
+
+void USBHost::free_string_buffer(strbuf_t *strbuf) 
+{
+	*(strbuf_t **)strbuf = free_strbuf_list;
+	free_strbuf_list = strbuf;
+}
+
 void USBHost::contribute_Devices(Device_t *devices, uint32_t num)
 {
 	Device_t *end = devices + num;
@@ -132,3 +151,12 @@ void USBHost::contribute_Transfers(Transfer_t *transfers, uint32_t num)
 	}
 }
 
+void USBHost::contribute_String_Buffers(strbuf_t *strbufs, uint32_t num)
+{
+	strbuf_t *end = strbufs + num;
+	for (strbuf_t *str = strbufs ; str < end; str++) {
+		free_string_buffer(str);
+	}
+}
+
+
diff --git a/midi.cpp b/midi.cpp
index 7e5723e..83068c4 100644
--- a/midi.cpp
+++ b/midi.cpp
@@ -31,6 +31,7 @@ void MIDIDevice::init()
 {
 	contribute_Pipes(mypipes, sizeof(mypipes)/sizeof(Pipe_t));
 	contribute_Transfers(mytransfers, sizeof(mytransfers)/sizeof(Transfer_t));
+	contribute_String_Buffers(mystring_bufs, sizeof(mystring_bufs)/sizeof(strbuf_t));
 	handleNoteOff = NULL;
 	handleNoteOn = NULL;
 	handleVelocityChange = NULL;
diff --git a/serial.cpp b/serial.cpp
index 7f9e9b7..e6a8989 100644
--- a/serial.cpp
+++ b/serial.cpp
@@ -35,6 +35,7 @@ void USBSerial::init()
 {
 	contribute_Pipes(mypipes, sizeof(mypipes)/sizeof(Pipe_t));
 	contribute_Transfers(mytransfers, sizeof(mytransfers)/sizeof(Transfer_t));
+	contribute_String_Buffers(mystring_bufs, sizeof(mystring_bufs)/sizeof(strbuf_t));
 	driver_ready_for_device(this);
 }