diff --git a/cpp/scsidump/scsidump_core.cpp b/cpp/scsidump/scsidump_core.cpp
index 92d2e1ce67..0d20757294 100644
--- a/cpp/scsidump/scsidump_core.cpp
+++ b/cpp/scsidump/scsidump_core.cpp
@@ -93,7 +93,7 @@ void ScsiDump::ParseArguments(span<char *> args)
     int buffer_size = DEFAULT_BUFFER_SIZE;
 
     opterr = 0;
-    while ((opt = getopt(static_cast<int>(args.size()), args.data(), "i:f:s:t:rvpIS")) != -1) {
+    while ((opt = getopt(static_cast<int>(args.size()), args.data(), "i:f:o:s:t:rvpIS")) != -1) {
         switch (opt) {
         case 'i':
             if (!GetAsUnsignedInt(optarg, initiator_id) || initiator_id > 7) {
@@ -116,6 +116,10 @@ void ScsiDump::ParseArguments(span<char *> args)
 
             break;
 
+        case 'o':
+            start_sector = static_cast<uint64_t>(strtoull(optarg, NULL, 0));
+            break;
+
         case 'S':
         	scan_bus = true;
         	break;
@@ -549,8 +553,18 @@ int ScsiDump::DumpRestore()
     	return EXIT_FAILURE;
     }
 
+    // Dump by buffer size
+    auto dsiz = static_cast<int>(buffer.size());
+    const int duni = dsiz / inq_info.sector_size;
+    auto dnum = static_cast<int>((inq_info.capacity * inq_info.sector_size) / dsiz);
+
+    // Verify start sector.
+    if (start_sector % duni != 0) {
+        throw parser_exception("Start sector must be a multiple of " + to_string(duni) + " (= bufsize / sectsize)");
+    }
+
     fstream fs;
-    fs.open(filename, (restore ? ios::in : ios::out) | ios::binary);
+    fs.open(filename, (restore ? ios::in : ios::out) | ios::binary | ios::app);
 
     if (fs.fail()) {
         throw parser_exception("Can't open image file '" + filename + "'");
@@ -573,19 +587,16 @@ int ScsiDump::DumpRestore()
         } else if (size < (off_t)(inq_info.sector_size * inq_info.capacity)) {
             throw parser_exception("File size is smaller than disk size");
         }
+        fs.seekg(start_sector * inq_info.sector_size);
     } else {
+        fs.seekp(start_sector * inq_info.sector_size);
         cout << "Starting dump\n" << flush;
     }
 
-    // Dump by buffer size
-    auto dsiz = static_cast<int>(buffer.size());
-    const int duni = dsiz / inq_info.sector_size;
-    auto dnum = static_cast<int>((inq_info.capacity * inq_info.sector_size) / dsiz);
-
     const auto start_time = chrono::high_resolution_clock::now();
 
     int i;
-    for (i = 0; i < dnum; i++) {
+    for (i = start_sector / duni; i < dnum; i++) {
         if (restore) {
             fs.read((char*)buffer.data(), dsiz);
             Write10(i * duni, duni, dsiz);
diff --git a/cpp/scsidump/scsidump_core.h b/cpp/scsidump/scsidump_core.h
index 58feb41915..8bf07449a6 100644
--- a/cpp/scsidump/scsidump_core.h
+++ b/cpp/scsidump/scsidump_core.h
@@ -87,6 +87,8 @@ class ScsiDump
 
     string filename;
 
+    uint64_t start_sector = 0;
+
     bool inquiry = false;
 
     bool scan_bus = false;
diff --git a/doc/scsidump.1 b/doc/scsidump.1
index 7fb7f3fc22..0cf806795e 100644
--- a/doc/scsidump.1
+++ b/doc/scsidump.1
@@ -33,6 +33,8 @@ If the generated drive image is intended to be used with PiSCSI, the drive image
 Display INQUIRY data of ID[:LUN].
 .It Fl i Ar BID
 SCSI ID of the PiSCSI device. If not specified, the PiSCSI device will use ID 7. The PiSCSI host will be functioning as the "Initiator" device.
+.It Fl o Ar offs
+Use `offs` as the sector offset to start dumping. It must be aligned to the buffer size. Can be used to resume an aborted transfer from/to a somewhat broken device by specifying the last shown sector number.
 .It Fl f Ar FILE
 Path to the dump file.
 .It Fl p
@@ -52,12 +54,12 @@ Enable verbose logging.
 Dump Mode: [SCSI Drive] ---> [PiSCSI host]
 .Pp
 Launch scsidump to dump an all data from SCSI ID 3 with block size 64 KiB, store it to the local filesystem as a drive image named outimage.hda, and generate the outimage.hda.properties file with the drive's INQUIRY information:
-.Dl Nm scsidump Fl t 3 Fl f ./outimage.hda Fl s 65536 Fl p
+.Dl Nm scsidump -t 3 -f ./outimage.hda -s 65536 -p
 .Pp
 Restore Mode: [PiSCSI host] ---> [SCSI Drive]
 .Pp
 Launch scsidump to restore/upload a drive image from the local file system to SCSI ID 0 with block size 1MiB:
-.Dl Nm scsidump Fl r Fl t 0 Fl f ./outimage.hda Fl s 1048576
+.Dl Nm scsidump -r -t 0 -f ./outimage.hda -s 1048576
 .Sh SEE ALSO
 .Xr scsictl 1 ,
 .Xr piscsi 1 ,