diff --git a/firmware/application/Makefile b/firmware/application/Makefile
index a6bb3cb9..31201908 100755
--- a/firmware/application/Makefile
+++ b/firmware/application/Makefile
@@ -164,6 +164,7 @@ CPPSRC = main.cpp \
          ui_debug.cpp \
          ui_baseband_stats_view.cpp \
          ui_sd_card_status_view.cpp \
+         ui_sd_card_debug.cpp \
          ui_console.cpp \
          ui_receiver.cpp \
          ui_spectrum.cpp \
@@ -189,6 +190,7 @@ CPPSRC = main.cpp \
          ../common/chibios_cpp.cpp \
          ../common/debug.cpp \
          ../common/gcc.cpp \
+         ../common/lfsr_random.cpp \
          core_control.cpp \
          cpld_max5.cpp \
          jtag.cpp \
diff --git a/firmware/application/ui_debug.cpp b/firmware/application/ui_debug.cpp
index fda852bc..e3d673a0 100644
--- a/firmware/application/ui_debug.cpp
+++ b/firmware/application/ui_debug.cpp
@@ -28,6 +28,8 @@
 
 #include "audio.hpp"
 
+#include "ui_sd_card_debug.hpp"
+
 namespace ui {
 
 /* DebugMemoryView *******************************************************/
@@ -272,7 +274,7 @@ DebugMenuView::DebugMenuView(NavigationView& nav) {
 	add_items<5>({ {
 		{ "Memory",      [&nav](){ nav.push<DebugMemoryView>(); } },
 		{ "Radio State", [&nav](){ nav.push<NotImplementedView>(); } },
-		{ "SD Card",     [&nav](){ nav.push<NotImplementedView>(); } },
+		{ "SD Card",     [&nav](){ nav.push<SDCardDebugView>(); } },
 		{ "Peripherals", [&nav](){ nav.push<DebugPeripheralsMenuView>(); } },
 		{ "Temperature", [&nav](){ nav.push<TemperatureView>(); } },
 	} });
diff --git a/firmware/application/ui_sd_card_debug.cpp b/firmware/application/ui_sd_card_debug.cpp
new file mode 100644
index 00000000..25d9ba5d
--- /dev/null
+++ b/firmware/application/ui_sd_card_debug.cpp
@@ -0,0 +1,409 @@
+/*
+ * Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "ui_sd_card_debug.hpp"
+
+#include "string_format.hpp"
+
+#include "file.hpp"
+#include "lfsr_random.hpp"
+
+#include "ff.h"
+
+#include "ch.h"
+#include "hal.h"
+
+class SDCardTestThread {
+public:
+	enum Result {
+		FailCompare = -8,
+		FailReadIncomplete = -7,
+		FailWriteIncomplete = -6,
+		FailAbort = -5,
+		FailFileOpenRead = -4,
+		FailFileOpenWrite = -3,
+		FailHeap = -2,
+		FailThread = -1,
+		Incomplete = 0,
+		OK = 1,
+	};
+
+	struct Stats {
+		halrtcnt_t write_duration_min { 0 };
+		halrtcnt_t write_duration_max { 0 };
+		halrtcnt_t write_test_duration { 0 };
+		size_t write_bytes { 0 };
+		size_t write_count { 0 };
+
+		halrtcnt_t read_duration_min { 0 };
+		halrtcnt_t read_duration_max { 0 };
+		halrtcnt_t read_test_duration { 0 };
+		size_t read_bytes { 0 };
+		size_t read_count { 0 };
+	};
+
+	SDCardTestThread(
+	) {
+		thread = chThdCreateFromHeap(NULL, 2048, NORMALPRIO + 10, SDCardTestThread::static_fn, this);
+	}
+
+	Result result() const {
+		return _result;
+	}
+
+	const Stats& stats() const {
+		return _stats;
+	}
+
+	~SDCardTestThread() {
+		chThdTerminate(thread);
+		chThdWait(thread);
+	}
+
+private:
+	static constexpr size_t write_size = 16384;
+	static constexpr size_t bytes_to_write = 16 * 1024 * 1024;
+	static constexpr size_t bytes_to_read = bytes_to_write;
+
+	static Thread* thread;
+	volatile Result _result { Result::Incomplete };
+	Stats _stats;
+
+	static msg_t static_fn(void* arg) {
+		auto obj = static_cast<SDCardTestThread*>(arg);
+		obj->_result = obj->run();
+		return 0;
+	}
+
+	Result run() {
+		const std::string filename { "_PPTEST_.DAT" };
+
+		const auto write_result = write(filename);
+		if( write_result != Result::OK ) {
+			return write_result;
+		}
+
+		if( _stats.write_bytes < bytes_to_write ) {
+			return Result::FailWriteIncomplete;
+		}
+
+		if( chThdShouldTerminate() ) {
+			return Result::FailAbort;
+		}
+
+		const auto read_result = read(filename);
+		if( read_result != Result::OK ) {
+			return read_result;
+		}
+
+		f_unlink(filename.c_str());
+
+		if( _stats.read_bytes < bytes_to_read ) {
+			return Result::FailReadIncomplete;
+		}
+
+		if( chThdShouldTerminate() ) {
+			return Result::FailAbort;
+		}
+
+		return Result::OK;
+	}
+
+	Result write(const std::string& filename) {
+		const auto buffer = std::make_unique<std::array<uint8_t, write_size>>();
+		if( !buffer ) {
+			return Result::FailHeap;
+		}
+
+		File file;
+		if( !file.open_for_writing(filename) ) {
+			return Result::FailFileOpenWrite;
+		}
+
+		lfsr_word_t v = 1;
+
+		const halrtcnt_t test_start = halGetCounterValue();
+		while( !chThdShouldTerminate() && file.is_ready() && (_stats.write_bytes < bytes_to_write) ) {
+			lfsr_fill(v,
+				reinterpret_cast<lfsr_word_t*>(buffer->data()),
+				sizeof(*buffer.get()) / sizeof(lfsr_word_t)
+			);
+
+			const halrtcnt_t write_start = halGetCounterValue();
+			if( !file.write(buffer->data(), buffer->size()) ) {
+				break;
+			}
+			const halrtcnt_t write_end = halGetCounterValue();
+			_stats.write_bytes += buffer->size();
+			_stats.write_count++;
+
+			const halrtcnt_t write_duration = write_end - write_start;
+			if( (_stats.write_duration_min == 0) || (write_duration < _stats.write_duration_min) ) {
+				_stats.write_duration_min = write_duration;
+			}
+			if( write_duration > _stats.write_duration_max ) {
+				_stats.write_duration_max = write_duration;
+			}
+		}
+
+		file.close();
+		
+		const halrtcnt_t test_end = halGetCounterValue();
+		_stats.write_test_duration = test_end - test_start;
+
+		return Result::OK;
+	}
+
+	Result read(const std::string& filename) {
+		const auto buffer = std::make_unique<std::array<uint8_t, write_size>>();
+		if( !buffer ) {
+			return Result::FailHeap;
+		}
+
+		File file;
+		if( !file.open_for_reading(filename) ) {
+			return Result::FailFileOpenRead;
+		}
+
+		lfsr_word_t v = 1;
+
+		const halrtcnt_t test_start = halGetCounterValue();
+		while( !chThdShouldTerminate() && file.is_ready() && (_stats.read_bytes < bytes_to_read) ) {
+			const halrtcnt_t read_start = halGetCounterValue();
+			if( !file.read(buffer->data(), buffer->size()) ) {
+				break;
+			}
+			const halrtcnt_t read_end = halGetCounterValue();
+			_stats.read_bytes += buffer->size();
+			_stats.read_count++;
+
+			const halrtcnt_t read_duration = read_end - read_start;
+			if( (_stats.read_duration_min == 0) || (read_duration < _stats.read_duration_min) ) {
+				_stats.read_duration_min = read_duration;
+			}
+			if( read_duration > _stats.read_duration_max ) {
+				_stats.read_duration_max = read_duration;
+			}
+
+			if( !lfsr_compare(v,
+				reinterpret_cast<lfsr_word_t*>(buffer->data()),
+				sizeof(*buffer.get()) / sizeof(lfsr_word_t))
+			) {
+				return Result::FailCompare;
+			}
+		}
+
+		file.close();
+		
+		const halrtcnt_t test_end = halGetCounterValue();
+		_stats.read_test_duration = test_end - test_start;
+
+		return Result::OK;
+	}
+};
+
+Thread* SDCardTestThread::thread { nullptr };
+
+namespace ui {
+
+SDCardDebugView::SDCardDebugView(NavigationView& nav) {
+	add_children({ {
+		&text_title,
+		&text_detected_title,
+		&text_detected_value,
+		&text_bus_width_title,
+		&text_bus_width_value,
+		&text_card_mode_title,
+		&text_card_mode_value,
+		// &text_csd_title,
+		// &text_csd_value,
+		&text_block_size_title,
+		&text_block_size_value,
+		&text_block_count_title,
+		&text_block_count_value,
+		&text_capacity_title,
+		&text_capacity_value,
+		&text_test_write_time_title,
+		&text_test_write_time_value,
+		&text_test_write_rate_title,
+		&text_test_write_rate_value,
+		&text_test_read_time_title,
+		&text_test_read_time_value,
+		&text_test_read_rate_title,
+		&text_test_read_rate_value,
+		&button_test,
+		&button_ok,
+	} });
+
+	button_test.on_select = [this](Button&){ this->on_test(); };
+	button_ok.on_select = [&nav](Button&){ nav.pop(); };
+}
+
+void SDCardDebugView::on_show() {
+	sd_card_status_signal_token = sd_card::status_signal += [this](const sd_card::Status status) {
+		this->on_status(status);
+	};
+	on_status(sd_card::status());
+}
+
+void SDCardDebugView::on_hide() {
+	sd_card::status_signal -= sd_card_status_signal_token;
+}
+
+void SDCardDebugView::focus() {
+	button_ok.focus();
+}
+
+void SDCardDebugView::on_status(const sd_card::Status) {
+	text_bus_width_value.set("");
+	text_card_mode_value.set("");
+	// text_csd_value.set("");
+	text_block_size_value.set("");
+	text_block_count_value.set("");
+	text_capacity_value.set("");
+	text_test_write_time_value.set("");
+	text_test_write_rate_value.set("");
+	text_test_read_time_value.set("");
+	text_test_read_rate_value.set("");
+
+	const bool is_inserted = sdcIsCardInserted(&SDCD1);
+	text_detected_value.set(is_inserted ? "Yes" : " No");
+
+	if( is_inserted ) {
+		const auto card_width_flags = LPC_SDMMC->CTYPE & 0x10001;
+		size_t card_width = 0;
+		switch(card_width_flags) {
+		case 0x00000: card_width = 1; break;
+		case 0x00001: card_width = 4; break;
+		case 0x10001: card_width = 8; break;
+		default: break;
+		}
+
+		text_bus_width_value.set(card_width ? to_string_dec_uint(card_width, 1) : "X");
+		text_card_mode_value.set("0x" + to_string_hex(SDCD1.cardmode, 8));
+		// text_csd_value.set("0x" + to_string_hex(SDCD1.csd, 8));
+
+		BlockDeviceInfo block_device_info;
+		if( sdcGetInfo(&SDCD1, &block_device_info) == CH_SUCCESS ) {
+			text_block_size_value.set(to_string_dec_uint(block_device_info.blk_size, 5));
+			text_block_count_value.set(to_string_dec_uint(block_device_info.blk_num, 9));
+			const uint64_t capacity = block_device_info.blk_size * uint64_t(block_device_info.blk_num);
+			if( capacity >= 1000000000 ) {
+				const uint32_t capacity_mb = capacity / 1000000U;
+				const uint32_t fraction_gb = capacity_mb % 1000;
+				const uint32_t capacity_gb = capacity_mb / 1000U;
+				text_capacity_value.set(
+					to_string_dec_uint(capacity_gb, 3) + "." +
+					to_string_dec_uint(fraction_gb, 3, '0') + " GB"
+				);
+			} else {
+				const uint32_t capacity_kb = capacity / 1000U;
+				const uint32_t fraction_mb = capacity_kb % 1000;
+				const uint32_t capacity_mb = capacity_kb / 1000U;
+				text_capacity_value.set(
+					to_string_dec_uint(capacity_mb, 3) + "." +
+					to_string_dec_uint(fraction_mb, 3, '0') + " MB"
+				);
+			}
+		}
+	}
+}
+
+static std::string format_ticks_as_ms(const halrtcnt_t value) {
+	const uint32_t us = uint64_t(value) * 1000000U / halGetCounterFrequency();
+	const uint32_t ms_frac = us % 1000U;
+	const uint32_t ms_int = us / 1000U;
+	if( ms_int < 1000 ) {
+		return to_string_dec_uint(ms_int, 3) + "." + to_string_dec_uint(ms_frac, 3, '0');
+	} else {
+		return "HHH.HHH";
+	}
+}
+
+static std::string format_bytes_per_ticks_as_mib(const size_t bytes, const halrtcnt_t ticks) {
+	const uint32_t bps = uint64_t(bytes) * halGetCounterFrequency() / ticks;
+	const uint32_t kbps = bps / 1000U;
+	const uint32_t mbps_frac = kbps % 1000U;
+	const uint32_t mbps_int = kbps / 1000U;
+	if( mbps_int < 1000 ) {
+		return to_string_dec_uint(mbps_int, 3) + "." + to_string_dec_uint(mbps_frac, 3, '0');
+	} else {
+		return "HHH.HHH";
+	}
+}
+
+void SDCardDebugView::on_test() {
+	text_test_write_time_value.set("");
+	text_test_write_rate_value.set("");
+	text_test_read_time_value.set("");
+	text_test_read_rate_value.set("");
+
+	SDCardTestThread thread;
+
+	// uint32_t spinner_phase = 0;
+	while( thread.result() == SDCardTestThread::Result::Incomplete ) {
+		chThdSleepMilliseconds(100);
+
+		// spinner_phase += 1;
+		// char c = '*';
+		// switch(spinner_phase % 4) {
+		// case 0: c = '-';  break;
+		// case 1: c = '\\'; break;
+		// case 2: c = '|';  break;
+		// case 3: c = '/';  break;
+		// default: c = '*'; break;
+		// }
+		// text_test_write_value.set({ c });
+	}
+
+	if( thread.result() == SDCardTestThread::Result::OK ) {
+		const auto stats = thread.stats();
+		const auto write_duration_avg = stats.write_test_duration / stats.write_count;
+
+		text_test_write_time_value.set(
+			format_ticks_as_ms(stats.write_duration_min) + "/" +
+			format_ticks_as_ms(write_duration_avg) + "/" +
+			format_ticks_as_ms(stats.write_duration_max)
+		);
+
+		text_test_write_rate_value.set(
+			format_bytes_per_ticks_as_mib(stats.write_bytes, stats.write_duration_min * stats.write_count) + " " +
+			format_bytes_per_ticks_as_mib(stats.write_bytes, stats.write_test_duration)
+		);
+
+		const auto read_duration_avg = stats.read_test_duration / stats.read_count;
+
+		text_test_read_time_value.set(
+			format_ticks_as_ms(stats.read_duration_min) + "/" +
+			format_ticks_as_ms(read_duration_avg) + "/" +
+			format_ticks_as_ms(stats.read_duration_max)
+		);
+
+		text_test_read_rate_value.set(
+			format_bytes_per_ticks_as_mib(stats.read_bytes, stats.read_duration_min * stats.read_count) + " " +
+			format_bytes_per_ticks_as_mib(stats.read_bytes, stats.read_test_duration)
+		);
+	} else {
+		text_test_write_time_value.set("Fail: " + to_string_dec_int(toUType(thread.result()), 4));
+	}
+}
+
+} /* namespace ui */
diff --git a/firmware/application/ui_sd_card_debug.hpp b/firmware/application/ui_sd_card_debug.hpp
new file mode 100644
index 00000000..a573f3a1
--- /dev/null
+++ b/firmware/application/ui_sd_card_debug.hpp
@@ -0,0 +1,203 @@
+/*
+ * Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __UI_SD_CARD_DEBUG_H__
+#define __UI_SD_CARD_DEBUG_H__
+
+#include "ui_widget.hpp"
+#include "ui_navigation.hpp"
+
+#include "sd_card.hpp"
+
+namespace ui {
+
+class SDCardDebugView : public View {
+public:
+	SDCardDebugView(NavigationView& nav);
+
+	void on_show() override;
+	void on_hide() override;
+
+	void focus() override;
+
+private:
+	SignalToken sd_card_status_signal_token;
+
+	void on_status(const sd_card::Status status);
+	void on_test();
+
+	Text text_title {
+		{ (240 - (7 * 8)) / 2, 1 * 16, (7 * 8), 16 },
+		"SD Card",
+	};
+
+	static constexpr size_t detected_characters = 3;
+
+	Text text_detected_title {
+		{ 0, 3 * 16, (8 * 8), 16 },
+		"Detected",
+	};
+
+	Text text_detected_value {
+		{ 240 - (detected_characters * 8), 3 * 16, (detected_characters * 8), 16 },
+		"",
+	};
+
+	static constexpr size_t bus_width_characters = 1;
+
+	Text text_bus_width_title {
+		{ 0, 5 * 16, (9 * 8), 16 },
+		"Bus width",
+	};
+
+	Text text_bus_width_value {
+		{ 240 - (bus_width_characters * 8), 5 * 16, (bus_width_characters * 8), 16 },
+		"",
+	};
+
+	static constexpr size_t card_mode_characters = 10;
+
+	Text text_card_mode_title {
+		{ 0, 6 * 16, (9 * 8), 16 },
+		"Card mode",
+	};
+
+	Text text_card_mode_value {
+		{ 240 - (card_mode_characters * 8), 6 * 16, (card_mode_characters * 8), 16 },
+		"",
+	};
+
+	// static constexpr size_t csd_characters = 10;
+
+	// Text text_csd_title {
+	// 	{ 0, 7 * 16, (3 * 8), 16 },
+	// 	"CSD",
+	// };
+
+	// Text text_csd_value {
+	// 	{ 240 - (csd_characters * 8), 7 * 16, (csd_characters * 8), 16 },
+	// 	"",
+	// };
+
+	static constexpr size_t block_size_characters = 5;
+
+	Text text_block_size_title {
+		{ 0, 8 * 16, (10 * 8), 16 },
+		"Block size",
+	};
+
+	Text text_block_size_value {
+		{ 240 - (block_size_characters * 8), 8 * 16, (block_size_characters * 8), 16 },
+		"",
+	};
+
+	static constexpr size_t block_count_characters = 9;
+
+	Text text_block_count_title {
+		{ 0, 9 * 16, (11 * 8), 16 },
+		"Block count",
+	};
+
+	Text text_block_count_value {
+		{ 240 - (block_count_characters * 8), 9 * 16, (block_count_characters * 8), 16 },
+		"",
+	};
+
+	static constexpr size_t capacity_characters = 10;
+
+	Text text_capacity_title {
+		{ 0, 10 * 16, (8 * 8), 16 },
+		"Capacity",
+	};
+
+	Text text_capacity_value {
+		{ 240 - (capacity_characters * 8), 10 * 16, (capacity_characters * 8), 16 },
+		"",
+	};
+
+	///////////////////////////////////////////////////////////////////////
+
+	static constexpr size_t test_write_time_characters = 23;
+
+	Text text_test_write_time_title {
+		{ 0, 12 * 16, (4 * 8), 16 },
+		"W ms",
+	};
+
+	Text text_test_write_time_value {
+		{ 240 - (test_write_time_characters * 8), 12 * 16, (test_write_time_characters * 8), 16 },
+		"",
+	};
+
+	static constexpr size_t test_write_rate_characters = 23;
+
+	Text text_test_write_rate_title {
+		{ 0, 13 * 16, (6 * 8), 16 },
+		"W MB/s",
+	};
+
+	Text text_test_write_rate_value {
+		{ 240 - (test_write_rate_characters * 8), 13 * 16, (test_write_rate_characters * 8), 16 },
+		"",
+	};
+
+	///////////////////////////////////////////////////////////////////////
+
+	static constexpr size_t test_read_time_characters = 23;
+
+	Text text_test_read_time_title {
+		{ 0, 14 * 16, (4 * 8), 16 },
+		"R ms",
+	};
+
+	Text text_test_read_time_value {
+		{ 240 - (test_read_time_characters * 8), 14 * 16, (test_read_time_characters * 8), 16 },
+		"",
+	};
+
+	static constexpr size_t test_read_rate_characters = 23;
+
+	Text text_test_read_rate_title {
+		{ 0, 15 * 16, (6 * 8), 16 },
+		"R MB/s",
+	};
+
+	Text text_test_read_rate_value {
+		{ 240 - (test_read_rate_characters * 8), 15 * 16, (test_read_rate_characters * 8), 16 },
+		"",
+	};
+
+	///////////////////////////////////////////////////////////////////////
+
+	Button button_test {
+		{ 16, 17 * 16, 96, 24 },
+		"Test"
+	};
+
+	Button button_ok {
+		{ 240 - 96 - 16, 17 * 16, 96, 24 },
+		"OK"
+	};
+};
+
+} /* namespace ui */
+
+#endif/*__UI_SD_CARD_DEBUG_H__*/