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Add information about the SDLT density codes.

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Submitted by:	"Stewart MacLund" <sundie@lunaticfringe.org>
MFC after:	1 week
This commit is contained in:
Joerg Wunsch 2002-10-15 12:53:29 +00:00
parent 54a63f9f1c
commit 75e861d635
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=105155
2 changed files with 7 additions and 0 deletions
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5
usr.bin/mt/mt.1
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@ -286,6 +286,8 @@ Value Width Tracks Density Code Type Reference Note
0x2A
0x2B 12.7 (0.5) 3 ? ? ? C X3.267 5
0x41 12.7 (0.5) 208 3,868 (98,250) RLL C DLTapeIV(40) 6,7
0x48 12.7 (0.5) 448 5,236 (133,000) PRML C SDLTapeI(110) 6,8
0x49 12.7 (0.5) 448 7,598 (193,000) PRML C SDLTapeI(160) 6,8
.Ed
.Bd -literal -offset 3n
Code Description Type Description
@ -297,6 +299,7 @@ IMFM Inverted modified frequency modulation
MFM Modified frequency modulation
DDS DAT data storage
RLL Run length limited
PRML Partial Response Maximum Likelihood
.Ed
.Bd -literal -offset 3n
NOTES
@ -308,6 +311,8 @@ NOTES
an industry standard definition of the media format.
7. DLT recording: serially recorded track pairs (DLTapeIII and
DLTapeIV(20)), or track quads (DLTapeIV(35) and DLTapeIV(40)).
8. Super DLT (SDLT) recording: 56 serially recorded logical tracks with
8 physical tracks each.
.Ed
.Sh ENVIRONMENT
If the following environment variable exists, it is utilized by

2
usr.bin/mt/mt.c
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@ -455,6 +455,8 @@ struct densities {
{ 0x27, 3056, 77611, "Mammoth" },
{ 0x28, 1491, 37871, "X3.224" },
{ 0x41, 3868, 98250, "DLTapeIV(40GB)" },
{ 0x48, 5236, 133000, "SDLTapeI(110)" },
{ 0x49, 7598, 193000, "SDLTapeI(160)" },
{ 0, 0, 0, NULL }
};