Emulated tape devices from the BS2000 viewpoint

Instead of the EMFILEs and CDROM files, BS2000 sees tape devices of the type BM1662FS which are addressed by means of their mnemonics. In the drives tapes of the type T6250 (T9G) are visible which are addressed using their VSNs and are handled in the same way.

EMFILEs

The following BS2000 commands are relevant for tape drives which are emulated by EMFILEs:

/ATTACH-DEVICE

Attaches a tape device; mandatory before use.

/DETACH-DEVICE

Detaches a tape device. The actions uploading, downloading, deletion of the data, and removal of the emulated device via the SE Manager only make sense in the “detached” status.

INIT utility routine

Initialization of a tape using the INIT utility routine; mandatory if a new EMFILE emulates a tape. For details, see the "Utility Routines" manual [11]. Specify “T9G” as the volume type and define the VSN.

CDROM files

The following BS2000 commands are relevant for tape devices which are emulated by CDROM files:

/ATTACH-DEVICE

Attaches a tape device; mandatory before use. Even if the CD or DVD drive is empty, the corresponding tape device can be attached in BS2000. When you have inserted a CD/DVD later, enter the /CHECK-TAPE command to make the mounted volume known to BS2000.

/CHECK-TAPE

Makes a mounted volume (CD/DVD) in the emulated tape drive known to BS2000. The /CHECK-TAPE command is needed if the drive was still empty when a previous /ATTACH-DEVICE command was issued or the CD/DVD was changed after /UNLOAD-TAPE.

/DETACH-DEVICE

Detaches a tape device. Access to the CD drive from Linux is forbidden while the device concerned is attached in BS2000. After it has been detached, any CD still contained in the drive can be ejected by pressing the button on the drive.

/UNLOAD-TAPE

Burns a CD or DVD, which is then ejected.

INIT utility routine

Initialization of a volume by the INIT utility routine; mandatory when a CD/DVD straight from the factory is inserted. For details, see the “Utility Routines” manual [11]. Specify “T9G” as the volume type and define the VSN. If the CD/DVD is rewritable, any existing data is overwritten.
You use the ERASE operand in the INIT statement to initiate complete deletion of a rewritable CD/DVD.

Procedure for burning a CD/DVD

Proceed as follows to burn a CD or DVD in the drive of the MU or SU x86:

>	Initialize the CDROM file using the INIT utility routine and specify a VSN in the process.
>	Make the CD or DVD known to BS2000: /ATTACH-DEVICE or (if that has already been issued) /CHECK-TAPE
>	Initialize the CDROM file with the INIT utility routine and assign a VSN. All data on a rewritable medium will be deleted.
>	Write the CDROM file with BS2000 means. This file is initially buffered on hard disk. The buffered file must contain more than 5 tape blocks, and the data must be terminated with a double tape mark (indicating the logical end of a BS2000 tape). The buffered data is retained until it is deleted when initialization takes place again (INIT) or until a data medium is written for this drive again.
>	Burn another CD/DVD using the /UNLOAD-TAPE command. After the medium has been burned, it is ejected from the DVD burner (i.e. the drive opens).
>	Burn another CD/DVD or detach the device (/DETACH-DEVICE).

CD/DVD media supported

The following media are supported for the burning functionality:

• CD-R

• CD-RW (minimum speed 4x)

• DVD-R / DVD+R

• DVD-RW / DVD+RW

• DVDRAM

The end-of-tape processing depends on the size of the medium. The maximum net size of the CDROM file is 4200 MB and is correspondingly lower in the case of a smaller medium since the space for the table of contents and lead-in / lead-out is deducted (CD: up to 32 MB / DVD: up to 128 MB).

Times of different CD/DVD media

The burning times (or initialization times) depend on the medium used and the possible speed for burning/deleting. The table below provides some information for estimating roughly how long the procedure will take (tests with a few different media).

Medium	Time INIT	Time INIT ... ERASE	Time /UNLOAD-TAPE (burn)
DVD-R 8x	2 sec	-	11 min (4200 MB)
CD-R 52x	2 sec	-	7 min (650 MB)
CD-RW 4x-10x	130 sec	10 min	10 min (650 MB)
DVD+RW 1x-4x	30 sec	16 min	15 min (4200 MB)
DVDRAM 3x-20x	20 sec	40 min	37 min (4200 MB)