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Disk Utility show WRONG hard drive size, No boot

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Please help me:


1. I can only boot with DVD inside. Why?

2. My HDD is 250 Mb, I'm missing 100 GB (look down with red)

3. What is cylinders deal ?


I have windows and 10.4.5 on separate hard drives. Here is the info.


in knoppix:

command - sudo fdisk /dev/hda


The number of cylinders for this disk is set to 30401.

There is nothing wrong with that, but this is larger than 1024,

and could in certain setups cause problems with:

1) software that runs at boot time (e.g., old versions of LILO)

2) booting and partitioning software from other OSs



command - p (print the partition table)


isk /dev/hda: 250.0 GB, 250059350016 bytes

255 heads, 63 sectors/track, 30401 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes


Device Boot Start End Blocks Id System

/dev/hda1 * 1 30401 244196001 af Unknown

isk /dev/hda: 250.0 GB, 250059350016 bytes




command - sudo cfdisk


cfdisk 2.12p

Disk Drive: /dev/hda

Size: 250059350016 bytes, 250.0 GB

Heads: 255 Sectors per Track: 63 Cylinders: 30401


Name Flags Part Type FS Type [Label] Size (MB)


hda1 Boot Primary Unknown (AF) 250056.74


Disk Utility in OSx:

Name : OSx

Type : Volume

Disk Identifier : disk2s1

File System : Mac OS Extended (Journaled)

Connection Bus : ATA

Partition Type : Apple_HFS

it just doesn't add (missing like 100 Gb):

Capacity : 232.9 GB (250,056,705,024 Bytes)

Free Space : 80.1 GB (86,017,773,568 Bytes)

Used : 47.9 GB (51,421,147,136 Bytes)

Bootable : Yes

Disk Number : 2

Partition Number : 1

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