diff --git a/src/main.rs b/src/main.rs
index 75f2f29..03eb441 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -46,12 +46,21 @@ enum DiskCommands {
         size: u8,
     },
 
-    // disk write subcommand
-    #[clap(name = "write-test", about = "Write a large file to determine sequential disk write speeds.")]
-    WriteTest {
+    // sequential disk write subcommand
+    #[clap(name = "write_seq", about = "Write a large file to determine sequential disk write speeds.")]
+    WriteSeqTest {
         #[clap(short = 't', default_value_t = String::from("/tmp/disk-test.tmp"))]
         tempfile: String,
-        #[clap(short = 's', default_value_t = 5)]
+        #[clap(short = 's', default_value_t = 15)]
+        size: u8,
+    },
+
+    // random 4K disk write subcommand
+    #[clap(name = "write_rand", about = "Write a bunch of smallfiles to determine random disk write speeds.")]
+    WriteRandTest {
+        #[clap(short = 't', default_value_t = String::from("/tmp/disk-test.tmp"))]
+        tempfile: String,
+        #[clap(short = 's', default_value_t = 15)]
         size: u8,
     },
 }
@@ -91,7 +100,8 @@ fn main() {
         Commands::Disk(args) => match &args.disk_commands {
             DiskCommands::ReadSeqTest { tempfile, size } => tests::disk::disk_read_seq_test(tempfile, size),
             DiskCommands::ReadRandTest { tempfile, size } => tests::disk::disk_read_rand_test(tempfile, size),
-            DiskCommands::WriteTest { tempfile, size } => tests::disk::disk_write_test(tempfile, size),
+            DiskCommands::WriteSeqTest { tempfile, size } => tests::disk::disk_write_seq_test(tempfile, size),
+            DiskCommands::WriteRandTest { tempfile, size } => tests::disk::disk_write_rand_test(tempfile, size),
         }
 
         Commands::Net(args) => match &args.net_commands {
diff --git a/src/tests/disk.rs b/src/tests/disk.rs
index 8fc2208..0c2e70c 100644
--- a/src/tests/disk.rs
+++ b/src/tests/disk.rs
@@ -1,4 +1,3 @@
-use std::fs;
 use std::process::Command;
 
 // test disk sequential read speeds w/ fio
@@ -40,6 +39,33 @@ pub fn disk_read_rand_test(tempfile: &str, size: &u8) {
         .arg("--blocksize=4k")
         .arg("--ioengine=libaio")
         .arg("--fsync=1")
+        .arg("--iodepth=1")
+        .arg("--direct=1")
+        .arg("--numjobs=32")
+        .arg("--runtime=60")
+        .arg("--group_reporting")
+        .output()
+        .expect("Failed to execute command");
+
+    // check that the command succeeded
+    assert!(output.status.success());
+
+    // print the test's output
+    println!("{}", String::from_utf8_lossy(&output.stdout));
+}
+
+// test sequential disk write speeds w/ fio
+pub fn disk_write_seq_test(tempfile: &str, size: &u8) {
+    // run the fio command
+    let output = Command::new("fio")
+        .arg("--name=TEST")
+        .arg(format!("--filename={}", tempfile))
+        .arg("--rw=write")
+        .arg("--size=2g")
+        .arg(format!("--io_size={}g", size))
+        .arg("--blocksize=1024k")
+        .arg("--ioengine=libaio")
+        .arg("--fsync=10000")
         .arg("--iodepth=32")
         .arg("--direct=1")
         .arg("--numjobs=1")
@@ -55,29 +81,29 @@ pub fn disk_read_rand_test(tempfile: &str, size: &u8) {
     println!("{}", String::from_utf8_lossy(&output.stdout));
 }
 
-// test disk write speeds by continually writing zeroes to it
-pub fn disk_write_test(tempfile: &str, size: &u8) {
-    // convert size in Gigabytes down to Megabytes
-    let size_gigs: u32 = (*size as u32 * 1024).into();
-
-    // run the dd command with a block size of 1 MB
-    let output = Command::new("dd")
-        .arg("bs=1M")
-        .arg(format!("count={}", size_gigs))
-        .arg("if=/dev/zero")
-        .arg(format!("of={}", tempfile))
+// test random 4K disk write speeds w/ fio
+pub fn disk_write_rand_test(tempfile: &str, size: &u8) {
+    // run the fio command
+    let output = Command::new("fio")
+        .arg("--name=TEST")
+        .arg(format!("--filename={}", tempfile))
+        .arg("--rw=randrw")
+        .arg("--size=2g")
+        .arg(format!("--io_size={}g", size))
+        .arg("--blocksize=4k")
+        .arg("--ioengine=libaio")
+        .arg("--fsync=1")
+        .arg("--iodepth=1")
+        .arg("--direct=1")
+        .arg("--numjobs=32")
+        .arg("--runtime=60")
+        .arg("--group_reporting")
         .output()
         .expect("Failed to execute command");
 
     // check that the command succeeded
     assert!(output.status.success());
 
-    // for whatever reason, `dd` output ends up in stderr
-    println!("{}", String::from_utf8_lossy(&output.stderr));
-
-    // remove the test file
-    match fs::remove_file(tempfile) {
-        Ok(()) => println!("Cleaning up..."),
-        Err(e) => println!("There was a problem during cleanup - {}", e),
-    }
+    // print the test's output
+    println!("{}", String::from_utf8_lossy(&output.stdout));
 }