diff --git a/mxraid/mxraid_assemble b/mxraid/mxraid_assemble
index 89616dc..aa40f94 100755
--- a/mxraid/mxraid_assemble
+++ b/mxraid/mxraid_assemble
@@ -169,7 +169,7 @@ if ($opts{n}) {
 
   my ($entry, $cnt, $size) = ('', 0, 0);
   my ($level, $num_wanted, $match) = (6, 16, undef);
-  my $chunk_size = 512;
+  my $chunk_size = 2048; # this is experimental
   my $dev_no = 0;
   my @mounts = split m/\n/, `cat /proc/self/mounts`;
   my @candidates;
@@ -200,7 +200,7 @@ if ($opts{n}) {
     print "#  NOTE: $msg\n";
   }
 
-  if ($opts{n} !~ m/^[CDM][\da-f]\d{3}$/) {
+  if ($opts{n} !~ m/^[CDM][\da-z]\d{3}$/) {
     my $msg = "label '$opts{n}' doesn't follow the CDM scheme.";
     $msg = $color->t_red($msg) unless $opts{m};
     print "#  NOTE: $msg\n";
@@ -221,7 +221,7 @@ if ($opts{n}) {
     $size /= 1024**4; # TB
 
 
-    # 100TB -> 512k, 50TB -> 256k
+    # 300TB -> 2048k (?), 200TB -> 1024k, 100TB -> 512k, 50TB -> 256k
     while ( $size/$chunk_size < 0.115 and $chunk_size > 64) {
       $chunk_size/=2;
     }
@@ -450,7 +450,7 @@ exit;
 
       @rec = split m/\s+/, $_;
 
-      if ($rec[0] !~ m/[CDM][\da-f]\d{3}:/) {
+      if ($rec[0] !~ m/[CDM][\da-z]\d{3}:/) {
         warn "#  NOTE: raid name not in expected format (bad key '$rec[0]' at line $lines).\n" if $self->{verbose} >= 1;
         next;
       }
@@ -518,7 +518,7 @@ exit;
     my $self = shift;
     my %tmp;
     for (keys %{$self->{db}}) {
-      my ($cat,$size,$num) = $_ =~ m/([CDM])([\da-f])(\d{3})/;
+      my ($cat,$size,$num) = $_ =~ m/([CDM])([\da-z])(\d{3})/;
       next unless defined $num;
       $cat = '(C/M)' if $cat ne 'D';
       if (exists $tmp{"$cat$size"} and $tmp{"$cat$size"} > $num) {
@@ -546,6 +546,7 @@ exit;
        ST8000NM001A  => sub {substr $_[0], 0, 8},
        ST1000NM0045  => sub {substr $_[0], 0, 8},
        ST14000NM002G => sub {substr $_[0], 0, 8},
+       ST16000NM004J => sub {substr $_[0], 0, 8},
     );
   }