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Difference between Sequential Access - Read and Sequential Access - Write?
- Thread starter Robert_J
- Start date
SpaceHonkey
Gawd
- Joined
- Jan 25, 2007
- Messages
- 983
Both vinyl records and splindle (aka non-SSD) hard drives work in a similar way. Rotating media and a head system to read off of that media.
When playing a record, the needle/head follows one track around the surface of the disk. This is sequential read. The difference between swquential read and random read is a random read is similar to if you pick up the head and try to find the next track and let it play. Doing so causes music to stop playing while there is a "random" seek.
The difference between sequential - read and sequential write is that with sequential writes, instead of playing back music, you would instead be writing music to the record. Imagine having a microphone and a device that would transfer vocals/ instrument sound from the microphone and write it directly to the record. It would do so in a similar manner as playback, except you would be writing data. That is sequential write. Random write would be recording part of a track, moving the recording needle while recording part of track 1 to do a portion of track 2 before again picking up the recording head and returning to track 1.
Hope that made sense as I've worked about 70 hrs since Sunday and I've yet to have a coffee.
When playing a record, the needle/head follows one track around the surface of the disk. This is sequential read. The difference between swquential read and random read is a random read is similar to if you pick up the head and try to find the next track and let it play. Doing so causes music to stop playing while there is a "random" seek.
The difference between sequential - read and sequential write is that with sequential writes, instead of playing back music, you would instead be writing music to the record. Imagine having a microphone and a device that would transfer vocals/ instrument sound from the microphone and write it directly to the record. It would do so in a similar manner as playback, except you would be writing data. That is sequential write. Random write would be recording part of a track, moving the recording needle while recording part of track 1 to do a portion of track 2 before again picking up the recording head and returning to track 1.
Hope that made sense as I've worked about 70 hrs since Sunday and I've yet to have a coffee.
Sequential Read = Sector 1 > Sector 2 > Sector 3 > Sector 4 > Sector 5 and so on, in sequence, the data is laid out in a non-fragmented form on the platters.
Sequential Write = The same thing but instead of reading the data off the platters it's putting it down aka writing.
Random Read = Sector 1 > Sector 41 > Sector 35 > Sector 12 > Sector 37 and so on, pulling data in sectors that aren't sequential and typically caused by fragmentation.
Random Write = The same thing but... well, you can figure it out from here, right?
Storage technology works best when the data can be read or written in a sequential manner because it's basically putting it down without having to move the read/write head around as much. The record album analogy is a good one:
The song is laid in the groove sequentially (a record album only has 2 grooves, one on each side) - imagine if the song was split into 5 second chunks and the needle actually had to jump all over the place over the surface of the record as fast as it could: 5 seconds here > 5 seconds there > 5 seconds there, etc. It's a waste of time and efficiency so... sequential access gives the best possible performance.
And really... LMGTFY? Geez... why bother responding at all?
Sequential Write = The same thing but instead of reading the data off the platters it's putting it down aka writing.
Random Read = Sector 1 > Sector 41 > Sector 35 > Sector 12 > Sector 37 and so on, pulling data in sectors that aren't sequential and typically caused by fragmentation.
Random Write = The same thing but... well, you can figure it out from here, right?
Storage technology works best when the data can be read or written in a sequential manner because it's basically putting it down without having to move the read/write head around as much. The record album analogy is a good one:The song is laid in the groove sequentially (a record album only has 2 grooves, one on each side) - imagine if the song was split into 5 second chunks and the needle actually had to jump all over the place over the surface of the record as fast as it could: 5 seconds here > 5 seconds there > 5 seconds there, etc. It's a waste of time and efficiency so... sequential access gives the best possible performance.
And really... LMGTFY? Geez... why bother responding at all?