2. Data Format and Basic Operations
Data recorded to HDDs by the
Generally, recording and playback are performed by observing the HDD as sequential media.
| Start of recording |
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Start ID |
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| Start ID |
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ID001 | ID002 | ID003 | ID004 | T | Blank | |
ID999 O | ||||||
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BOM | ID number increments | TOC | EOD | EOM | ||
BOD | .SHIFT +INDEX/ID key | |||||
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.When the INDEX number exceeds 99
INDEX01 INDEX99
INDEX number increment
.INDEX/ID key
BOM (Beginning Of Media) | Position of beginning physical recording. |
BOD (Beginning Of Data) | User data is recorded from here. |
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EOD (End Of Data) | Each time recording stops, an EOD is written. |
| When a recording is added, the previous EOD is overwritten and |
| deleted, and a new EOD is written at the location where the last |
| recording ended. Generally, data cannot be read after the EOD, even |
| if previously recorded data remains. |
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EOM (End Of Media) | Last position where recording is physically possible. |
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ID number | ID blocks are formed for each recording with ID numbers (001 to 999) |
| automatically assigned. These can be used for ID searches. |
| Increments |
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| . Start of each recording (including cancellation of recording |
| pauses) |
| . When the index number exceeds 99 |
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| . When the INDEX/ID key is pressed after the SHIFT key during |
| recording |
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INDEX number | An index (01 to 99) can be added at desired locations during |
| measuring. By marking an index, the desired location can quickly be |
| found during analysis (INDEX search). |
| Increments |
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| . When the INDEX/ID key is pressed during recording |
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Start ID | This indicates the point where recording starts.The start ID is not actually |
| written on the recording media, but the position is registered in the TOC. |
| The start ID can be used for start ID searches. |
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TOC (Table of Contents) | The position and other information for all ID blocks are recorded in table |
| format in this area. |
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(E) |