DLT (Digital Linear Tape) Drives &
          ETL (Enterprise Tape Library) Libraries


TYPE                 NATIVE         ADVERTISED CAPACITY
                     CAPACITY (Gb)  W/COMPRESSION (Gb)
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Single Drives:

DLT 4000                  20 [l]        40 [m]

DLT 7000                  35 [h]        70 [u]        DLT tape IV 
                  

DLT 8000 40 [h] 80 [u] DLT tape IV

SuperDLT 110 [h] 220 [u] Super DLTtape I

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Tape Libraries:

DLT 4700                 140 [l]       280 [m]
(1 4000, 7 slots)

ETL 4/1000               960 [l]      1920 [m]
(4000 drives, 48 slots)

ETL 4/1800              1680 [h]      3360 [u]
(7000 drives, 48 slots)

ETL 7/3500              3360 [h]      6720 [u]
(7000 drives, 96 slots)

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Notes:

1. Letters in square brackets above are suggested density flags.

2. /dev/rmt density specifiers:
   DLT 4000:  typically "l" (low) is used for native mode, and "m"
      (medium) is used to turn on the compression feature on 4000s.
      This seems to be the convention used at Sun.

   DLT 7000:  four density specifiers can be used with this model.
      l and m will produce the 20 and 40 Gb capacities (like the
      4000).  However, if "h" is used, the maximum native capacity
      will be achieved.  To obtain the maximum storage using com-
      pression, use "u" .

3. Marketing usually advertises tape drive capacity by assuming
   a 2:1 compression ratio.  In reality, the resulting capacity
   is generally about 1.8:1 .  So for a drive that holds 20Gb in
   native mode, like the 4000, the capacity derived using hard-
   ware compression will usually approach 36Gb.  Capacity figures
   above assume that a type "IV" cartridge was used.  (These are
   the most popular).  Other variations are available and are
   compatible with Sun's drives, however they offer less capacity.

4. Customers can buy an ETL 7/3500 with 2 drives initially, and then
   acquire the other 5 later.