JVC GZMC500US
Service Manual

2.5

Format When Windows reads the file, it cannot deal the file as one file unless the scattered clusters in the drive are rounded up. Also, when writing in, the data are stored in each cluster and the clusters should be placed in their original location. It is too inefficient as it takes too much time. From the above examples the following can be said; 4K-byte cluster size format for comparatively small files such as Windows systems and various programs, 8 to 16 K-byte cluster size format for medium files such as Office documents including MS Word, and 32K-byte cluster size format for large files such as video and audio for efficient disk recording. Media that are formatted in FAT16(FAT) or FAT32 can be used with EVERIO.EVERIO does not support NTFS. If a NTFS-formatted medium is inserted into EVERIO, "THIS CARD IS NOT FORMATTED" is displayed. Originally, Microdrives were developed as mass storage for PC and peripherals, and their main purpose is to store data. As a result, Microdrives are formatted in FAT32(4K-byte cluster size) as same as other PC and peripherals. Yet as previously mentioned, the files that are recorded/ read with EVERIO are video/ audio files with enormous file size. Therefore, it is necessary to be formatted in the maximum 32Kbyte cluster size. If it is formatted with EVERIO, it is automatically formatted in FAT32(32K-byte cluster size) If it is formatted in FAT32(32K-byte cluster size) with a PC, normally, this special format cannot be done. If you need to carry out this format with a PC for some reason, input from MS-DOS prompt as follows. format d: /z:64 (As d: is a Microdrive drive, it differs according to the environment of each PC.) /z:64 is a special setting for format, meaning that it is formatted in 64sector cluster size (1sector=512-byte) Numbers of sectors 1 2 4 8 16 32 64 4KB cluster size 512B 1KB 2KB 4KB 8KB 16KB 32KB

As Windows file system, either FAT16 or FAT32 is used. There is another file system called NTFS, which is used with Windows 2000 and Windows XP. FAT stands for File Allocation Table and it has been used since the introduction of MS-DOS. Until the arrival of Windows 95 OSR2, FAT meant FAT16. When FAT32 appeared, FAT16 and FAT32 are distinguished respectively. Generally, data and programs are dealt as files in computer related field. A file system is a function of OS (Operation System) such as Windows.In FAT, files are stored as unit of boxes called clusters in storage (drive) in the premises called a hard disk. If they are just stored, it is hard to search them afterward. So the location of each file is written in the ledger (FAT) with the number of each location. You can see the location of the box (cluster) of certain file if you check with the ledger (FAT). A ledger (FAT) is allocated to each storage (drive) unit. The numbers 16 or 32 of FAT16 or FAT32 each indicates 16-bits or 32-bits. Inside a computer everything is descried in binary numbers. With FAT16, 16-bits worth: 2 to the 16th power (65536) boxes can be controlled.And with FAT32, 32-bits worth: 2 to the 32nd power (65536�65536) boxes can be controlled. That is why they are called FAT16 and FAT32. The size of the boxes (clusters) changes like a balloon in proportion to the capacity of the storage (drive). However, the original size and the limit of the expansion size are determined: 4K- bytes as minimum and 32K-bytes as maximum. As it was explained earlier, 65536 boxes (clusters) can be controlled with FAT16. If the maximum capacity of a box (cluster) is 32K-bytes, the upper limit of the storage(drive) that can be recognized by Windows is 65536~32KB=2G-bytes s. It means that when a hard disk with more than 2G-bytes s is installed; it is divided into maximum 2G-bytes s with FAT16. Drive capacity Less than 256MB 256MB and over - less than 512MB 512MB and over - less than 1024MB 1024MB and over-less than 2048MB 2GB and over - less than 4GB 4GB and over - less than 8GB 8GB and over - less than 16GB 16GB and over - less than 32GB 32GB and over Can not setting 8KB 16KB 32KB Cluster size FAT16 4KB 8KB 16KB 32KB FAT32 Same as FAT16

(Table 2) Numbers of sectors and cluster size Besides the Instruction Book, EVERIO comes with a notice sheet that is written "Please read before use". On the sheet, "Format the provided Microdrive with the format function in the menu" is written. If the provided Microdrive is not formatted before use, it cannot process the data in the drive efficiently, as explained above, resulting in slow access to the medium, temporary video halt, or media error display. When a media error is displayed, selecting the CLEAN UP from the menu and performing it can temporarily avoid the error. However, the media error will be displayed again while using EVERIO. Therefore, when media error is displayed, make sure to format the Microdrive with EVERIO. (Please do not forget to backup the user data.) If the format is done with EVERIO, media with 2G-bytes and less are formatted in FAT16 (64 sectors), and media with 2G-bytes and over are formatted in FAT32 (64 sectors). (No.YF100)1-25

(Table 1) Drive capacity and cluster size The cluster size does not change how big or how small a file is. For example, if a 2G-byte drive is used in FAT16 to save a 1Kbyte file, one cluster (32K-bytes) is used to write in. If a 33K-byte file is saved, it is written in on a hard disk using two clusters (64K-bytes). In both cases 31K-bytes is left unused. It is not necessarily good to minimize the cluster size at all times. Video and audio data become extremely large files. If a 2G-byte drive is used in FAT32, normally the cluster size becomes 4K-bytes occupying 2560 clusters to save a 10M-byte file.